problem related to probability

Question

Question No. 1

A salesman is known to sell a product in 3 out of 5 attempts. While another

salesman in 2 out of 5 attempts. Find the probability that-

(a) No sales will happen.

(b) Either of them will succeed in selling the product.

 

Question No. 2

A hundred squash balls are tested by dropping from a height of 100 inches and measuring the height of the bounce. A ball is "fast" if it rises above 32 inches. The average height of bounce was 30 inches and the standard deviation was 3/4 inches. What is the chance of getting a "fast" standard ball?

Answer 1

A hundred squash balls are tested by dropping from a height of 100 inches and measuring the height of the bounce. A ball is "fast" if it rises above 32 inches. The average height of bounce was 30 inches and the standard deviation was 3/4 inches. What is the chance of getting a "fast" standard ball? * probability of an event asked Feb 19 in Statistics Answers by anonymous Please log in or register to add a comment.

Answer 2

 

Ans1: Let A be the event that the first salesman will sell the product and B be the event that the second salesman will sell the product.

Given 

(1) Probability that no sales will happen = P(A') × P(B')

 

(2) Probability that either of the salesman will succeed in selling the product = P(A') × P(B) + P(A) × P(B')

Answer 3

 

Given: T otal no. of observations N = 100

Mean,μ = 30inches

Standard deviation, σ=3/4 inches=0.75 inches

Suppose 'x' is the normal variable=32 inches

answer given by prakash karpenter.....