Help solve probability word problem

Question

Mr. H has 17 students 3 of which are freshmen and the others are sophomores and juniors. The probability of drawing a freshman first then sophomore is 3/34. How many sophomores are in there?

Answer 1

A box contains 9 green balls, 16 red balls, 9 white balls, and 6 black balls.

 

What is the probability of drawing a red ball out of the box?

Answer 2

you made 8 out 0f 15 shots on goal. use experimental probability to preduct how many goals you will make tomorrow if you take 70 shots

Answer 3

The sum of two standard dice being equal to 1?

Answer 4

Let B and S be the events of making the basketball and softball teams respectively. We have P(B) = 0.32, P(S) = 0.34, and P(B U S) = 0.50.  So, there is a 50% chance of being on the basketball team or the softball team, but not both. We need to solve for the probability of being on both teams!

Answer 5

How many different passwords can be made with letters and digits - the password must be eight digits or letters.