probability(1)

• Feb 18th 2011, 04:33 PM
jacks
probability(1)
(1) fifteen coupons are numbered $1,2,3,.......,15$.Seven Coupons are selected at random with replacement. Then find the probability no. appearing on a selected coupons is $9$
• Feb 18th 2011, 05:51 PM
mr fantastic
Quote:

Originally Posted by jacks
(1) fifteen coupons are numbered $1,2,3,.......,15$.Seven Coupons are selected at random with replacement. Then find the probability no. appearing on a selected coupons is $9$

Quote:

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.
• Feb 18th 2011, 07:19 PM
jacks
actually I have not getting any idea in that question.

Thanks.