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Probability questions

Records of a department store show that 5% of customers who make a purchase return the merchandise for refund. Of the remaining customers, 9% return the mechanise in order to exchange it.

a) In the next six purchase, what is the probability that at most one will return for refund?
b) In a sample of eight customers, exactly 2 returned the merchandise for refund. What is the probability that less than give will return the merchandise for exchange?

Solution Preview

a)
Prob = p(0) + p(1) - 0.735+0.23 = 0.967

p=0.05
N = 6
(6,0)
0.05(1-0.05)to the power of 6 = ...

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