Math Homework Answers - Recent questions and answers in Statistics Answers
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Powered by Question2AnswerAnswered: how to calculate pass mark if 60% of students pass
https://www.mathhomeworkanswers.org/243366/how-to-calculate-pass-mark-if-60%25-of-students-pass?show=243372#a243372
<p style="text-align:justify">If 60% of 100 students passed, then 60 students passed.</p>
<p style="text-align:justify">Let's say the pass mark was 45%, then it means that 60 students scored 45% or more.</p>
<p style="text-align:justify">If the pass mark was 67%, then 60 students scored 67% or more. </p>
<p style="text-align:justify">The number of students obtaining a pass is not directly related to the pass mark. The probability that a student selected randomly obtained a pass is 60%, but it doesn't determine the pass mark itself.</p>Statistics Answershttps://www.mathhomeworkanswers.org/243366/how-to-calculate-pass-mark-if-60%25-of-students-pass?show=243372#a243372Fri, 23 Jun 2017 09:53:16 +0000Answered: find n if P(n,4) = 42 p(n,1)
https://www.mathhomeworkanswers.org/243111/find-n-if-p-n-4-42-p-n-1?show=243144#a243144
<p style="text-align: justify;">42=7*6 so the permutations must include this product of two consecutive integers. This gives us 7*6*5*4, 8*7*6*5, 9*8*7*6, corresponding to n=7, 8 or 9 and P(7,4), P(8,4) or P(9,4). But P(n,1)=7, 8 or 9 respectively.</p>
<p style="text-align: justify;">So P(7,4)=120P(7,1); P(8,4)=210P(8,1); P(9,4)=336P(9,1). None of these fit.</p>
<p style="text-align: justify;">But P(8,3)=42P(8,1) does fit for n=8.</p>Statistics Answershttps://www.mathhomeworkanswers.org/243111/find-n-if-p-n-4-42-p-n-1?show=243144#a243144Mon, 19 Jun 2017 01:19:53 +0000Answered: Find the other term?
https://www.mathhomeworkanswers.org/243125/find-the-other-term?show=243140#a243140
If the terms are 32 and x, then (32+x)/2=39; 32+x=78 and x=78-32=46.Statistics Answershttps://www.mathhomeworkanswers.org/243125/find-the-other-term?show=243140#a243140Mon, 19 Jun 2017 00:34:35 +0000Answered: There is 2326 orders to be planned in 5 hours. How many people are needed to do the job?
https://www.mathhomeworkanswers.org/242959/there-2326-orders-planned-hours-many-people-are-needed-the-job?show=242975#a242975
<p style="text-align: justify;">Assume that job means processing an order. If it takes t hours for one person to do a job, then p people can do the job in t/p hours. To process 2326 orders (jobs) in 5 hours 5=2326t/p, so t/p=5/2326. Therefore p=2326t/5=465.2t. So to find out how many people we need, we need to know how long one person takes to process an order. If t=0.1hr (6 minutes) then p=46.52, which implies 47 people are needed.; if t=0.25hr (15 minutes), p=116.3 or 117 people. If t=2/3hr (40 minutes) then p=310.13 or 311 people.</p>
<p style="text-align: justify;">If by job is meant orders to be planned I guess it could take only one person to do the planning!</p>Statistics Answershttps://www.mathhomeworkanswers.org/242959/there-2326-orders-planned-hours-many-people-are-needed-the-job?show=242975#a242975Wed, 14 Jun 2017 17:57:32 +0000Answered: You have 5 math books, 2 history books, and 6 science books. If the books are placed on a book shelf, what is the probability that each category is kept together?
https://www.mathhomeworkanswers.org/242894/history-science-placed-shelf-probability-category-together?show=242922#a242922
<p style="text-align:justify">Three are 6 ways of arranging the categories along the shelf: MHS, MSH, HMS, HSM, SMH, SHM, where M=math, H=history, S=science.</p>
<p style="text-align:justify">We can take each arrangement of categories and work out the probability of each arrangement.</p>
<p style="text-align:justify">Take MHS as an example. If M and H are organised to be kept together, then S automatically is kept together.</p>
<p style="text-align:justify">There are 13 books, 5 being math books. So the probability of selecting a math book in the first position on the shelf is 5/13, leaving 12 books, 4 of which are math. The probability of selecting another math book is 4/12. So the probability of the first 5 books being all math is 5/13.4/12.3/11.2/10.1/9=1/1287.</p>
<p style="text-align:justify">There are now 8 books left, 2 of which are history books. So the probability of selecting a history book next is 2/8, then 1/7 for the second history book. That's 2/8.1/7=1/28. The science books will all be together. Combine the math and history probabilities: 1/1287.1/28=1/36036.</p>
<p style="text-align:justify">Now let's take MSH. Next to math we have science and the probabilities are 6/8.5/7.4/6.3/5.2/4.1/3=1/28. When we combine the probabilities we again get 1/36036. And so it goes on for the other permutations of the categories.</p>
<p style="text-align:justify">So, adding the combined probabilities we get 6/36036=1/6006=0.01665%.</p>Statistics Answershttps://www.mathhomeworkanswers.org/242894/history-science-placed-shelf-probability-category-together?show=242922#a242922Tue, 13 Jun 2017 17:30:52 +0000Answered: basket have 3 bananas and 5 apples. Find the probability through binomial distribution for getting 2 apples.
https://www.mathhomeworkanswers.org/242557/bananas-probability-through-binomial-distribution-getting?show=242563#a242563
<p style="text-align:justify"><span style="line-height:1.6em">The chances of selecting an apple out of 8 fruits is p=5/8. The chances of not selecting an apple is 3/8 (1-p) and the probability of two apples and 6 non-apples (i.e., bananas)=0.0304 approx or about 3.04%.</span></p>
<p style="text-align:justify"> </p>Statistics Answershttps://www.mathhomeworkanswers.org/242557/bananas-probability-through-binomial-distribution-getting?show=242563#a242563Mon, 05 Jun 2017 10:17:52 +0000Answered: statistics
https://www.mathhomeworkanswers.org/242050/statistics?show=242502#a242502
<p style="text-align:justify">(a)(1) The probability of a sale is 0.20 so the probability of no sale is 0.80. The probability of no sales with 8 firms is 0.80^8=16.78% approx.</p>
<p style="text-align:justify">(2) We can use the binomial distribution with coefficients: 1 <a href="denied:tel:8 28 56 70 56 28 8 1" rel="nofollow">8 28 56 70 56 28 8 1</a>. For no more than 2 sales we need the first 3 coefficients. (p+(p-1))^8=p^8+8p^7(1-p)+28p^6(1-p)^2+... where p=0.80. The first term is no sales at all, the second term just one sale, and the third term two sales. The total probability is 79.69%.</p>
<p style="text-align:justify">(b)(1) Z score for X=10 is (10-7.5)/2.1=1.19 (approx) corresponding to 88.30%. So the percentage of students studying more than 10hrs per week is 11.70%. (2) If X=9, Z=0.7143, corresponding to 76.25%; and if X=7, Z=-0.2380, corresponding to 1-0.5940=40.60%. So the proportion of students spending 7-9 hours is 76.25-40.60=35.65% approx. (3) If X=3 then Z=-2.143, corresponding to 1-0.9839=0.0161 or about 1.61% of students spend less than 3 hrs a week studying. (4) In the distribution table Z=1.645 corresponding to 95%. Therefore Z=-1.645 corresponds to 5% and -1.645=(X-7.5)/2.1, X=7.5-3.4545=4.04 or about 4 hours. So 5% of students spend less than 4 hours studying per week.</p>
<p style="text-align:justify">(c) We don't know how many customers the clothing stores sees in one day. Should 2.7 be 2.7%?</p>Statistics Answershttps://www.mathhomeworkanswers.org/242050/statistics?show=242502#a242502Sat, 03 Jun 2017 14:18:38 +0000Answered: how many Sundays in 8900 weeks
https://www.mathhomeworkanswers.org/242453/how-many-sundays-in-8900-weeks?show=242474#a242474
Since there is only one Sunday per week there will be as many Sundays as there are weeks, 8900.Statistics Answershttps://www.mathhomeworkanswers.org/242453/how-many-sundays-in-8900-weeks?show=242474#a242474Fri, 02 Jun 2017 19:23:53 +0000Answered: factorise the following expressions (1). X ² + 6x + 8 (2). X² - 5x + 6
https://www.mathhomeworkanswers.org/242012/factorise-the-following-expressions-1-x-%C2%B2-6x-8-2-x%C2%B2-5x-6?show=242014#a242014
<p><em>factorise the following expressions (1). X ² + 6x + 8 (2). X² - 5x + 6</em></p>
<p>(1). X ² + 6x + 8 = <span style="text-decoration: underline;">(x + 2)(x + 4)</span></p>
<p>(2). X² - 5x + 6 = <span style="text-decoration: underline;">(x - 2)(x - 3)</span></p>Statistics Answershttps://www.mathhomeworkanswers.org/242012/factorise-the-following-expressions-1-x-%C2%B2-6x-8-2-x%C2%B2-5x-6?show=242014#a242014Wed, 24 May 2017 11:25:14 +0000Answered: the sets A= {x: 1<=x<=3} and B = {x: x= 1,10} are subsets of U = {x:1<=x<=10}, where X is an integer. (a) list the members of the sets A,B and U (b) Find A n B
https://www.mathhomeworkanswers.org/241992/sets-are-subsets-where-integer-list-the-members-the-sets-find?show=242006#a242006
<p><em>the sets A= {x: 1<=x<=3} and B = {x: x= 1,10} are subsets of U = {x:1<=x<=10}, where X is an integer. (a) list the members of the sets A,B and U (b) Find A n B </em></p>
<p>A = {z: 1 <= x <= 3} this gives <span style="text-decoration: underline;">A = {1, 2, 3}</span></p>
<p>B = {x: 1, 10} this gives <span style="text-decoration: underline;">B = {1, 10}</span></p>
<p>U = {x: 1 <= x <= 10} this gives <span style="text-decoration: underline;">U = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}</span></p>
<p>b) <span style="text-decoration: underline;">A n B = {1, 2, 3} n {1, 10} = {1}</span></p>Statistics Answershttps://www.mathhomeworkanswers.org/241992/sets-are-subsets-where-integer-list-the-members-the-sets-find?show=242006#a242006Wed, 24 May 2017 09:42:44 +0000Ten randomly selected groceries in
https://www.mathhomeworkanswers.org/241898/ten-randomly-selected-groceries-in
Ten randomly selected groceries in the city has an average sales of 2890000 from various goods with a standard deviation of 260000 is this enough evidence to conlcude that groceries are less than the average of php 3090000 from various goods months at a=0.05 using pvalue approachStatistics Answershttps://www.mathhomeworkanswers.org/241898/ten-randomly-selected-groceries-inSun, 21 May 2017 15:57:06 +0000Answered: Find out the number of ways of selecting the balls of different colours?
https://www.mathhomeworkanswers.org/241551/find-out-the-number-ways-selecting-balls-different-colours?show=241652#a241652
<p style="text-align:justify">If each ball is considered unique irrespective of colour, the number of ways of selecting 3 from 9 balls is 9*8*7/(3*2*1)=84. This is a combination of balls, so the order in which they are selected is not important.</p>
<p style="text-align:justify">If the balls are identified only by their colour, we can find out the possible combinations as follows. Remember there are only two blue balls.</p>
<table border="1" cellpadding="1" cellspacing="1" style="width:500px">
<tbody>
<tr>
<td> </td>
<td>Red</td>
<td>White</td>
<td>Blue</td>
</tr>
<tr>
<td>Blue</td>
<td>BR</td>
<td>BW</td>
<td>BB</td>
</tr>
<tr>
<td>White</td>
<td>WR</td>
<td>WW</td>
<td> </td>
</tr>
<tr>
<td>Red</td>
<td>RR</td>
<td> </td>
<td> </td>
</tr>
</tbody>
</table>
<p>The above table covers all combinations of 2 balls. There are 6.</p>
<table border="1" cellpadding="1" cellspacing="1" style="width:500px">
<tbody>
<tr>
<td> </td>
<td>BR</td>
<td>BW</td>
<td>BB</td>
<td>WR</td>
<td>WW</td>
<td>RR</td>
</tr>
<tr>
<td>B</td>
<td>BBR</td>
<td>BBW</td>
<td>X</td>
<td>BWR</td>
<td>BWW</td>
<td>BRR</td>
</tr>
<tr>
<td>W</td>
<td> </td>
<td> </td>
<td> </td>
<td>WWR</td>
<td>WWW</td>
<td>WRR</td>
</tr>
<tr>
<td>R</td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td>RRR</td>
</tr>
</tbody>
</table>
<p style="text-align:justify">The above table shows the results of combining the 2-ball combinations with the third ball.</p>
<p style="text-align:justify">X means nor permitted because there are only 2 blues. So, as long as it's only combinations of colours, not permutations or unique arrangements, there are only 9 ways to select the balls as given. The empty cells in both tables means that we have already included the combination elsewhere.</p>Statistics Answershttps://www.mathhomeworkanswers.org/241551/find-out-the-number-ways-selecting-balls-different-colours?show=241652#a241652Tue, 09 May 2017 12:35:14 +0000Answered: in how many ways can a committee of three be chosen from four married couple of one particular man must be on the committee
https://www.mathhomeworkanswers.org/241221/committee-three-chosen-married-couple-particular-committee?show=241226#a241226
<p style="text-align:justify">When the particular man has been selected, that leaves 4 women and 3 men for the remaining two members of the committee. The number of ways of </p>Statistics Answershttps://www.mathhomeworkanswers.org/241221/committee-three-chosen-married-couple-particular-committee?show=241226#a241226Thu, 27 Apr 2017 19:01:55 +0000Answered: In how many ways can the prizes be awarded?
https://www.mathhomeworkanswers.org/241216/in-how-many-ways-can-the-prizes-be-awarded?show=241220#a241220
<p style="text-align:justify">This is an example permutation. The answer is 10*9*8=720 ways.</p>
<p style="text-align:justify">There is a choice of 10 for selecting gold star first, leaving 9 essays. The next choice is for silver, and so picking gold and silver =10*9=90 ways. The last is bronze for which there are 8 choices, making 10*9*8=720 ways of selecting the stars.</p>
<p style="text-align:justify"> </p>Statistics Answershttps://www.mathhomeworkanswers.org/241216/in-how-many-ways-can-the-prizes-be-awarded?show=241220#a241220Thu, 27 Apr 2017 17:58:11 +0000Answered: standard deviation of 5.3%, a sample of 15 and the sample standard deviation is 5.5% and mean return is 11.2%. Construct a 98% confidence interval for the mean
https://www.mathhomeworkanswers.org/240794/standard-deviation-standard-deviation-construct-confidence?show=240797#a240797
<p style="text-align:justify">The number of degrees of freedom for a sample size of 15 is 15-1=14. The t-value for a 98% confidence interval with 14 dof is 2.624. The margin of error is 2.624*5.5/√15=3.73, so the mean, m, is in the interval:</p>
<p style="text-align:justify">11.2-3.73≤m≤11.2+3.73, that is, 7.5%≤m≤14.9%. This describes the interval for the mean annual return.</p>Statistics Answershttps://www.mathhomeworkanswers.org/240794/standard-deviation-standard-deviation-construct-confidence?show=240797#a240797Mon, 17 Apr 2017 18:51:21 +0000Answered: 1=5,2=25,3=125,4=3125,5=?
https://www.mathhomeworkanswers.org/6963/1-5-2-25-3-125-4-3125-5?show=240592#a240592
390,625Statistics Answershttps://www.mathhomeworkanswers.org/6963/1-5-2-25-3-125-4-3125-5?show=240592#a240592Tue, 11 Apr 2017 00:21:56 +0000Answered: linear correlation r=0.091
https://www.mathhomeworkanswers.org/95046/linear-correlation-r-0-091?show=240541#a240541
<p style="text-align: justify;">This value of r is very small, which implies that there is a weak correlation between X and Y data pairs.</p>Statistics Answershttps://www.mathhomeworkanswers.org/95046/linear-correlation-r-0-091?show=240541#a240541Sun, 09 Apr 2017 21:35:59 +0000Answered: Write a set of data that contains 12 values for which the box plant has no whiskers state the median first and third quartile's and lower and upper extremes
https://www.mathhomeworkanswers.org/240020/contains-values-plant-whiskers-median-quartiles-extremes?show=240115#a240115
<p style="text-align:justify">Consider the ordered dataset: 3.5, 3.5, 3.5, 3.5, 5, 7, 9, 11, 12.5, 12.5, 12.5, 12.5.</p>
<p style="text-align:justify">The lower limit is 3.5 and the upper limit 12.5.</p>
<p style="text-align:justify">Q1=3.5, Q2=Median=8, Q3=12.5 for the quartiles. The box plot is shown below:</p>
<p style="text-align:justify"><img alt="" src="https://www.mathhomeworkanswers.org/?qa=blob&qa_blobid=16673788678102307475" style="height:133px; width:400px"></p>
<p style="text-align: justify;">When the data range is the same as the interquartile range there are no whiskers.</p>Statistics Answershttps://www.mathhomeworkanswers.org/240020/contains-values-plant-whiskers-median-quartiles-extremes?show=240115#a240115Wed, 29 Mar 2017 11:50:01 +0000Answered: Write a set of data that, when displayed in a box plot, will result in a long box and short whiskers.
https://www.mathhomeworkanswers.org/240021/write-data-when-displayed-plot-will-result-long-short-whiskers?show=240114#a240114
<p style="text-align:justify">Consider the ordered dataset: 3, 3, 3, 4, 5, 7, 9, 11, 12, 13, 13, 13.</p>
<p style="text-align:justify">The data divides into two halves: 3, 3, 3, 4, 5, 7 and 9, 11, 12, 13, 13, 13. The median of all the data is between 7 and 9 so median=8. The medians of the two halves are 3.5 and 12.5, the values midway between 3 and 4 and 12 and 13. These are the first and third quartiles.</p>
<p style="text-align:justify">So Q1=3.5, Q2=8, Q3=12.5 for the quartiles. The box plot is shown below:</p>
<p style="text-align:justify"><img alt="" src="https://www.mathhomeworkanswers.org/?qa=blob&qa_blobid=1286037499745577814" style="height:116px; width:400px"></p>
<p style="text-align:justify">The whiskers are short because data outside the interquartile range are close to the limits of this range.</p>Statistics Answershttps://www.mathhomeworkanswers.org/240021/write-data-when-displayed-plot-will-result-long-short-whiskers?show=240114#a240114Wed, 29 Mar 2017 11:40:10 +0000Answered: 4/12 in equivalent fraction
https://www.mathhomeworkanswers.org/22562/4-12-in-equivalent-fraction?show=239371#a239371
<p><img alt="smiley" src="http://www.mathhomeworkanswers.org/qa-plugin/ckeditor4/plugins/smiley/images/regular_smile.gif" style="height:20px; width:20px" title="smiley">4/12 is equal to 4/12</p>Statistics Answershttps://www.mathhomeworkanswers.org/22562/4-12-in-equivalent-fraction?show=239371#a239371Tue, 14 Mar 2017 00:29:07 +0000Answered: How many ways can you choose 1 red ball?
https://www.mathhomeworkanswers.org/7865/how-many-ways-can-you-choose-1-red-ball?show=238740#a238740
<p style="text-align:justify">Imagine the balls are of two colours but of different sizes. This makes each red ball and white ball unique.</p>
<p style="text-align:justify">The possible colour outcomes are RRR, RRW, RWR, RWW, WRR, WRW, WWR, WWW.</p>
<p style="text-align:justify">But when we consider each ball as unique we get different numbers. For example, RRR could be R1R2R3, R1R2R4, R1R2R5, etc. The number of permutations is 9*8*7=504. The number of combinations is 504/6=84, because the number of ways of arranging 3 balls is 6. The permutation R1R2R3 is not the same as R2R3R1, for example. But the combination R1R2R3 is the same as the combination R2R3R1.</p>
<p style="text-align:justify">(1) The balls are picked at random and returned after selection.</p>
<p style="text-align:justify">Now consider probabilities. P(R) is the probability of picking a red ball, so P(R)=9/15=3/5 and 1-P(R)=P(W)=2/5. There are 3 ways of picking exactly one red: RWW, WRW, WWR and so P(RWW)=P(WRW)=P(WWR)=(3/5)(2/5)^2=12/125. Add the three together and we get 36/125. That means that if the number of outcomes is N, then the number of ways of picking just one red is 36N/125. So we need to define and find N. Considering the uniqueness of each ball there are 15^3=3375 outcomes. So N=3375 and 36/125 of 3375=972. There are 972 ways of selecting exactly one red ball (any one of 9 reds) out of a possible 3375 outcomes.</p>
<p style="text-align:justify">(2) The three balls are selected at the same time without returning any.</p>
<p style="text-align:justify">This alters the probability and the number of outcomes. N=2730 (=15*14*13). The probabilities also change. Let's look at RWW, WRW, WWR. P(RWW)=9/15*6/14*5/13; P(WRW)=6/15*9/14*5/13; P(WWR)=6/15*5/14*9/13. Note that these all have the same value=9/91, so when added together we have 27/91. When we apply this to N=2730, we get 27*2730/91=810 ways.</p>Statistics Answershttps://www.mathhomeworkanswers.org/7865/how-many-ways-can-you-choose-1-red-ball?show=238740#a238740Thu, 23 Feb 2017 12:41:50 +0000Answered: how do one compute the winsorized mean if the value of "k" is not an integer?
https://www.mathhomeworkanswers.org/127817/how-one-compute-the-winsorized-mean-the-value-is-not-integer?show=238311#a238311
<p style="text-align:justify">As I understand it, k is either an integer or a percentage. The purpose of winsorization is to reduce the effects of outliers in an ordered dataset. When k is an integer rather than a percentage, k identifies the number of elements from the low and high end that are to be winsorized. Therefore if k is not an integer, it must be a percentage. Let's take the example of k=1.2 and an ordered dataset of 1000 data values. 1.2% is equivalent to replacing the first 12 data with the value of the 13th data value and the last 12 data with the value of the 988th data value.</p>
<p style="text-align:justify">If the sum of the 13th to the 988th data values is S and the 13th data value is L and the 988th is H, then the mean for the whole data becomes (12L+S+12H)/1000. If the sum of the 24 outliers is X, the mean before winsorization would be (S+X)/1000. So the difference in the mean is (12(L+H)-X)/1000=0.012(L+H)-0.001X. That is, 1.2% of the sum of the lowest and highest values in the winsorized dataset less 0.1% of the total of the outliers. The percentage applied to X depends on how much data there is in the dataset. If the size of the dataset was 250 instead of 1000, it would be 0.4% of X, for example.</p>Statistics Answershttps://www.mathhomeworkanswers.org/127817/how-one-compute-the-winsorized-mean-the-value-is-not-integer?show=238311#a238311Fri, 17 Feb 2017 14:03:27 +0000Answered: What is the value of SS (sum of squared deviations) for the following sample? Sample: 1, 3, 2, 2
https://www.mathhomeworkanswers.org/237752/what-value-squared-deviations-the-following-sample-sample?show=237799#a237799
<p style="text-align: justify;">I assume you mean the deviations from the mean, which is (1+3+2+2)/4=2.
<br>
<br>
The sum of the squares of the deviations is (-1)^2+(1)^2+0+0=2.</p>Statistics Answershttps://www.mathhomeworkanswers.org/237752/what-value-squared-deviations-the-following-sample-sample?show=237799#a237799Mon, 13 Feb 2017 00:45:14 +0000Answered: write 420 as a product of its prime factors
https://www.mathhomeworkanswers.org/47492/write-420-as-a-product-of-its-prime-factors?show=237309#a237309
<p> <img alt="enlightened" src="http://www.mathhomeworkanswers.org/qa-plugin/ckeditor4/plugins/smiley/images/lightbulb.gif" style="height:20px; width:20px" title="enlightened"> 2x2x3x5x7</p>Statistics Answershttps://www.mathhomeworkanswers.org/47492/write-420-as-a-product-of-its-prime-factors?show=237309#a237309Tue, 07 Feb 2017 13:55:10 +0000Answered: number of dvd rented by four families is 8,4,2,and 16 use sample 3 and find the mean
https://www.mathhomeworkanswers.org/127762/number-dvd-rented-four-families-and-sample-and-find-the-mean?show=237191#a237191
<p>The mean is (8+4+16+2)/4=30/4=7.5.</p>
<p style="text-align: justify;">The variance is ((8-7.5)^2+(4-7.5)^2+(16-7.5)^2+(2-7.5)^2)/4=115/4=28.75.</p>
<p>Standard deviation is √28.75=5.36.</p>
<p style="text-align: justify;">This would give us 7.5±5.36 for the number of DVDs.</p>
<p style="text-align:justify">I'm not sure why 3 has been given as the sample size, but I assume that the standard deviation is to be calculated using 3 instead of 4 as the divisor. This means SD=√(115/3)=6.19 and the number of DVDs rented is 7.5±6.19 or the range 1.31 to 13.69.</p>Statistics Answershttps://www.mathhomeworkanswers.org/127762/number-dvd-rented-four-families-and-sample-and-find-the-mean?show=237191#a237191Sun, 05 Feb 2017 14:36:45 +0000Answered: The following data give the scores obtained by 9 of the students in Science and mathematics test.
https://www.mathhomeworkanswers.org/236871/following-give-scores-obtained-students-science-mathematics?show=236894#a236894
<p style="text-align:justify">This is the formula I'll be using for the correlation coefficient:</p>
<p style="text-align:justify"> </p>
<p style="text-align:justify"> </p>
<p style="text-align:center"><img alt="" src="http://www.mathhomeworkanswers.org/?qa=blob&qa_blobid=6894372175364743006" style="height:88px; width:150px"></p>
<p style="text-align:justify">where (x,y) are the given ordered pairs of results. It will be necessary to calculate means and standard deviations. n=9, the number of pairs. Mean x=80/9, mean y=98/9.</p>
<p style="text-align:justify"><img alt="" src="http://www.mathhomeworkanswers.org/?qa=blob&qa_blobid=10401757179682909334" style="height:153px; width:400px"></p>
<p style="text-align:justify">The table above shows the results. Column A is just the product of the data in the previous two columns, with the resultant total. R, the correlation coefficient, is this total divided by the square root of the product of the totals of the last two columns, according to the formula. So R=0.5 approximately.</p>Statistics Answershttps://www.mathhomeworkanswers.org/236871/following-give-scores-obtained-students-science-mathematics?show=236894#a236894Wed, 01 Feb 2017 11:24:18 +0000Answered: determine the measurement accuracy of field measured dimmnesions
https://www.mathhomeworkanswers.org/127801/determine-measurement-accuracy-field-measured-dimmnesions?show=236371#a236371
<p style="text-align:justify">One way perhaps is to take each pair of values and work out the absolute difference. You could work out the mean and standard deviation for the absolute differences of all the data pairs. You could apply a confidence level test to the results, by measuring how many standard deviations from the mean are the majority of the results (95%, 97.5%, 99% for example).</p>
<p style="text-align:justify">You could use a visual method by plotting the results on the same graph using different colours for the actual and forecast measurements. This may give you some idea whether to expect correlation. Join values with a vertical line to indicate the absolute difference between each pair.</p>
<p style="text-align:justify">You could combine methods and compare results.</p>Statistics Answershttps://www.mathhomeworkanswers.org/127801/determine-measurement-accuracy-field-measured-dimmnesions?show=236371#a236371Wed, 25 Jan 2017 10:03:49 +0000Answered: How many 3 4ths are in 7 8ths
https://www.mathhomeworkanswers.org/236301/how-many-3-4ths-are-in-7-8ths?show=236302#a236302
(7/8 )/(3/4)= 7/8 * 4/3 =7/6Statistics Answershttps://www.mathhomeworkanswers.org/236301/how-many-3-4ths-are-in-7-8ths?show=236302#a236302Mon, 23 Jan 2017 20:55:55 +0000Answered: if i roll a dice 10 times what is the probability i roll exactly 4 fives?
https://www.mathhomeworkanswers.org/127882/if-roll-dice-times-what-is-the-probability-roll-exactly-fives?show=236070#a236070
<p style="text-align:justify">Let's work out the probability of the first 4 throws coming up with a 5 each time: (1/6)^4. The probability that no fives will be thrown in the next 6 throws is (5/6)^6. So combine these: 5^6/6^10. But the 4 successful throws could occur 210 ways=10*9*8*7/(1*2*3*4), in other words, any combination of 4 out of 10. So we need to multiply our combined probability by this factor: 210(5^6)/6^10=0.0543 approx or 5.43%.</p>
<p style="text-align:justify">Another way is to use binomial expansion: (5/6+1/6)^10=1^10=1. This equation covers every possibility so that the sum of each of them comes to 1, certainty. Expanding into individual terms we get:</p>
<p style="text-align:justify">(5/6)^10+10*(5/6)^9*(1/6)+45*(5/6)^8(1/6)^2+120*(5/6)^7(1/6)^3+<strong>210*(5/6)^6(1/6)^4</strong>+...</p>
<p style="text-align:justify">The separate terms stand for: No fives at all; only one five; only two fives; only three fives; <strong>only four fives</strong>; ...</p>
<p style="text-align:justify">[If we were to add together the first five terms we would be finding the probability of up to four fives, or four fives at the most. It doesn't have to be a five; any specific number would have the same probability.]</p>Statistics Answershttps://www.mathhomeworkanswers.org/127882/if-roll-dice-times-what-is-the-probability-roll-exactly-fives?show=236070#a236070Wed, 18 Jan 2017 22:02:22 +0000Answered: find the expected return for a Bond Fund
https://www.mathhomeworkanswers.org/127881/find-the-expected-return-for-a-bond-fund?show=235984#a235984
<p><span style="background-color:rgb(255, 255, 255); color:rgb(51, 51, 51); font-family:sans-serif,arial,verdana,trebuchet ms; font-size:13px"><a href="http://brainly.com" rel="nofollow">http://brainly.com</a></span></p>Statistics Answershttps://www.mathhomeworkanswers.org/127881/find-the-expected-return-for-a-bond-fund?show=235984#a235984Tue, 17 Jan 2017 18:48:41 +0000Answered: Let x represent the number of work hours per week, where the mean is 40 and standard deviation is 10
https://www.mathhomeworkanswers.org/127892/represent-number-hours-week-where-mean-standard-deviation?show=235980#a235980
<p><span style="background-color:rgb(255, 255, 255); color:rgb(51, 51, 51); font-family:sans-serif,arial,verdana,trebuchet ms; font-size:13px"><a href="http://brainly.com" rel="nofollow">http://brainly.com</a></span></p>Statistics Answershttps://www.mathhomeworkanswers.org/127892/represent-number-hours-week-where-mean-standard-deviation?show=235980#a235980Tue, 17 Jan 2017 18:46:30 +0000Answered: 1.58 TO THE NEAREST HUNDRETHS PLACE
https://www.mathhomeworkanswers.org/128017/1-58-to-the-nearest-hundreths-place?show=235963#a235963
<p><span style="background-color:rgb(255, 255, 255); color:rgb(51, 51, 51); font-family:sans-serif,arial,verdana,trebuchet ms; font-size:13px"><a href="http://brainly.com" rel="nofollow">http://brainly.com</a></span></p>Statistics Answershttps://www.mathhomeworkanswers.org/128017/1-58-to-the-nearest-hundreths-place?show=235963#a235963Tue, 17 Jan 2017 18:33:58 +0000Answered: should we compulsorily make classes continuos for calculating mode
https://www.mathhomeworkanswers.org/128051/should-compulsorily-make-classes-continuos-calculating-mode?show=235957#a235957
<p style="text-align:justify">Rewrite the data as an ordered series. To do this we need to think how we do this with ranges. Each range covers 4 classes. With a frequency of 6 we could have, for example, 1 2 3 4 4 4. So since the class is a whole number, we have to repeat values, giving us up to 3 of one value, or 1 2 2 3 4 4.</p>
<p style="text-align:justify">Take the range 5-8, we have a frequency of 10 over 4 values. We could have 5 5 5 6 6 7 7 7 8 8 or we could have 5 6 6 6 6 7 7 7 7 8. There are two modes in the latter group. Looking at the group as a whole we would have to say that mode is likely in this group because we are distributing 10 data in a range of 4. So 5-8 contains at least one mode and it is likely to be higher than in the other groups.</p>
<p style="text-align:justify">We can't determine the mode itself absolutely without listing thr discreet data values.</p>
<p> </p>Statistics Answershttps://www.mathhomeworkanswers.org/128051/should-compulsorily-make-classes-continuos-calculating-mode?show=235957#a235957Tue, 17 Jan 2017 18:15:04 +0000Answered: name five main areas and three sub-areas that are part of the main areas in personnel research
https://www.mathhomeworkanswers.org/128145/main-areas-three-areas-that-part-main-areas-personnel-research?show=235938#a235938
<p><span style="background-color:rgb(255, 255, 255); color:rgb(51, 51, 51); font-family:sans-serif,arial,verdana,trebuchet ms; font-size:13px"><a href="http://brainly.com" rel="nofollow">http://brainly.com</a></span></p>Statistics Answershttps://www.mathhomeworkanswers.org/128145/main-areas-three-areas-that-part-main-areas-personnel-research?show=235938#a235938Tue, 17 Jan 2017 17:18:32 +0000Answered: How many squaremeters are there in 24by16bits?
https://www.mathhomeworkanswers.org/128288/how-many-squaremeters-are-there-in-24by16bits?show=235752#a235752
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https://www.mathhomeworkanswers.org/128312/can-you-find-quartiles-using-only-mean-the-standard-deviation?show=235695#a235695
<p style="text-align:justify">When you look in the body of a normal distribution table you can find the Z scores corresponding to 0.25 and 0.75. The Z score tells you how many standard deviations from the mean correspond to the Z scores. From this you can work out Q1 and Q3.</p>
<p style="text-align:justify">For Q1 Z=-0.675 and for Q3 Z=0.675. Z is calculated from the mean and standard deviation: Z=(X-m)/SD=(X-0.785)/0.071=0.675. |X-0.785|=0.675*0.071=0.048mm, making X=0.833mm for Q3 and 0.785-0.048=0.737mm for Q1.</p>
<p style="text-align:justify">Q1=0.737mm and Q3=0.833mm.</p>
<p style="text-align:justify">In a normal distribution half the data are below the mean and median (Q2) and half are above. The values we calculated for Q1 and Q3 divide the range into quartiles. A quarter of the data are below Q1 and above Q3. The interquartile range Q1 to Q3 contains half the data.</p>Statistics Answershttps://www.mathhomeworkanswers.org/128312/can-you-find-quartiles-using-only-mean-the-standard-deviation?show=235695#a235695Thu, 12 Jan 2017 00:00:10 +0000Answered: How many centimeter in 32×16 role centimeters?
https://www.mathhomeworkanswers.org/128307/how-many-centimeter-in-32-16-role-centimeters?show=235673#a235673
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https://www.mathhomeworkanswers.org/128320/what-are-the-most-unpopular-numbers-between-1-and155?show=235671#a235671
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https://www.mathhomeworkanswers.org/128339/normal-distribution?show=235668#a235668
<p><span style="background-color:rgb(255, 255, 255); color:rgb(51, 51, 51); font-family:sans-serif,arial,verdana,trebuchet ms; font-size:13px"><a href="http://brainly.com" rel="nofollow">http://brainly.com</a></span></p>Statistics Answershttps://www.mathhomeworkanswers.org/128339/normal-distribution?show=235668#a235668Wed, 11 Jan 2017 17:03:02 +0000Answered: What was the mean score for the two classes combined
https://www.mathhomeworkanswers.org/128414/what-was-the-mean-score-for-the-two-classes-combined?show=235663#a235663
<p><span style="background-color:rgb(255, 255, 255); color:rgb(51, 51, 51); font-family:sans-serif,arial,verdana,trebuchet ms; font-size:13px"><a href="http://brainly.com" rel="nofollow">http://brainly.com</a></span></p>Statistics Answershttps://www.mathhomeworkanswers.org/128414/what-was-the-mean-score-for-the-two-classes-combined?show=235663#a235663Wed, 11 Jan 2017 16:58:19 +0000Answered: What is the available space over 72×2=/144 spaces???01#00:44????
https://www.mathhomeworkanswers.org/128431/what-is-the-available-space-over-72-2-144-spaces-01%2300-44?show=235609#a235609
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https://www.mathhomeworkanswers.org/128498/the-collection-all-cars-registered-the-united-states-example?show=235599#a235599
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https://www.mathhomeworkanswers.org/128683/please-help-with-the-question-below?show=235418#a235418
<p><span style="background-color:rgb(255, 255, 255); color:rgb(51, 51, 51); font-family:sans-serif,arial,verdana,trebuchet ms; font-size:13px"><a href="http://www.brainly.com" rel="nofollow">http://www.brainly.com</a></span></p>Statistics Answershttps://www.mathhomeworkanswers.org/128683/please-help-with-the-question-below?show=235418#a235418Fri, 06 Jan 2017 21:50:40 +0000Answered: The mean score for student-athletes is 947 with a standard deviation of
https://www.mathhomeworkanswers.org/128905/the-mean-score-student-athletes-947-with-standard-deviation?show=235391#a235391
<p><span style="background-color:rgb(255, 255, 255); color:rgb(51, 51, 51); font-family:sans-serif,arial,verdana,trebuchet ms; font-size:13px"><a href="http://www.brainly.com" rel="nofollow">http://www.brainly.com</a></span></p>Statistics Answershttps://www.mathhomeworkanswers.org/128905/the-mean-score-student-athletes-947-with-standard-deviation?show=235391#a235391Fri, 06 Jan 2017 19:54:30 +0000Answered: how to compute the elasticities for independent variable.
https://www.mathhomeworkanswers.org/128994/how-to-compute-the-elasticities-for-independent-variable?show=235381#a235381
<p><span style="background-color:rgb(255, 255, 255); color:rgb(51, 51, 51); font-family:sans-serif,arial,verdana,trebuchet ms; font-size:13px"><a href="http://www.brainly.com" rel="nofollow">http://www.brainly.com</a></span></p>Statistics Answershttps://www.mathhomeworkanswers.org/128994/how-to-compute-the-elasticities-for-independent-variable?show=235381#a235381Fri, 06 Jan 2017 19:50:23 +0000Answered: What is the relationship between α and the confidence level of a hypothesis test?
https://www.mathhomeworkanswers.org/129012/what-relationship-between-confidence-level-hypothesis-test?show=235380#a235380
<p><span style="background-color:rgb(255, 255, 255); color:rgb(51, 51, 51); font-family:sans-serif,arial,verdana,trebuchet ms; font-size:13px"><a href="http://www.brainly.com" rel="nofollow">http://www.brainly.com</a></span></p>Statistics Answershttps://www.mathhomeworkanswers.org/129012/what-relationship-between-confidence-level-hypothesis-test?show=235380#a235380Fri, 06 Jan 2017 19:49:47 +0000Answered: what is the square root of 13.2 using interpolation
https://www.mathhomeworkanswers.org/129265/what-is-the-square-root-of-13-2-using-interpolation?show=235343#a235343
<p><span style="background-color:rgb(255, 255, 255); color:rgb(51, 51, 51); font-family:sans-serif,arial,verdana,trebuchet ms; font-size:13px"><a href="http://www.brainly.com" rel="nofollow">http://www.brainly.com</a></span></p>Statistics Answershttps://www.mathhomeworkanswers.org/129265/what-is-the-square-root-of-13-2-using-interpolation?show=235343#a235343Fri, 06 Jan 2017 17:47:47 +0000Answered: a graph with a mean of 4 a median of 3.5 a mode of 3 and a range of 4
https://www.mathhomeworkanswers.org/90007/a-graph-with-a-mean-of-4-a-median-of-3-5-a-mode-of-3-and-a-range-of-4?show=235342#a235342
<p><span style="background-color:rgb(255, 255, 255); color:rgb(51, 51, 51); font-family:sans-serif,arial,verdana,trebuchet ms; font-size:13px"><a href="http://www.brainly.com" rel="nofollow">http://www.brainly.com</a></span></p>Statistics Answershttps://www.mathhomeworkanswers.org/90007/a-graph-with-a-mean-of-4-a-median-of-3-5-a-mode-of-3-and-a-range-of-4?show=235342#a235342Fri, 06 Jan 2017 17:47:21 +0000what is the probability of an event : it will be warm in january in ontario
https://www.mathhomeworkanswers.org/234967/what-the-probability-event-it-will-warm-in-january-in-ontario
the answer of this question is 0.1 or 10% but how ? <br />
<br />
please explainStatistics Answershttps://www.mathhomeworkanswers.org/234967/what-the-probability-event-it-will-warm-in-january-in-ontarioTue, 03 Jan 2017 04:01:50 +0000probability question grade 8
https://www.mathhomeworkanswers.org/234966/probability-question-grade-8
<p><img alt="" src="http://www.mathhomeworkanswers.org/?qa=blob&qa_blobid=15288789561884294016" style="height:261px; width:600px"></p>
<p>i have solved all part except e please solve part e and explain too</p>
<p>possible outcomes are 3,4,5,6,7,8,9</p>
<p>probability of getting 3 is 1/16</p>
<p>getting 4 is 2/16</p>
<p>getting 5 is 3/16</p>
<p>getting 6 is 4/16</p>
<p>getting 7 is 3/16</p>
<p>getting 8 is 2/16</p>
<p>getting 9 is 1/16</p>Statistics Answershttps://www.mathhomeworkanswers.org/234966/probability-question-grade-8Tue, 03 Jan 2017 03:55:27 +0000