Thread: probability(1)

(1) fifteen coupons are numbered .Seven Coupons are selected at random with replacement. Then find the probability no. appearing on a selected coupons is

Originally Posted by jacks

(1) fifteen coupons are numbered .Seven Coupons are selected at random with replacement. Then find the probability no. appearing on a selected coupons is

Then find the probability no. appearing on a selected coupons is 9

How many selected coupons?

What you have here is a binomial distribution with n = 7 and p = 1/15.

If you need more help, please clarify the question, show what you've tried and say where you are stuck.

actually I have not getting any idea in that question.

Thanks.