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Mark the correct alternative in the following:
Fifteen coupons are numbered 1 to 15. Seven coupons are selected at random, one at a time with replacement. The probability that the largest umber appearing on a selected coupon is 9, is
Given:
P(selected coupon bears number 9)= p
p=9/15
= 3/5
P(selected coupon bears number 9) = p(all coupons bear number
9) – p( selected coupon bears number
8)
n=7
p(that all coupon bear number 9)
P(x=7)= 7C7 p7 q0
= p7
P(that the selected coupon bears number 9)
P= 8/15
P(x=7)= 7C7 p7 q0
= p7
Required probability