Recent statistics suggest that 15% of those who visit a retail site on the World

Question

Recent statistics suggest that 15% of those who visit a retail site on the World Wide Web make a purchase. A retailer wished to verify this claim. To do so, she selected a sample of 16 "hits" to her site and found that 4 had actually made a purchase.

What is the likelihood that four or more "hits" result in a purchase? (Round your answer to 2 decimal places.)

Recent statistics suggest that 15% of those who visit a retail site on the World Wide Web make a purchase. A retailer wished to verify this claim. To do so, she selected a sample of 16 "hits" to her site and found that 4 had actually made a purchase.

Explanation / Answer

ans=

a)P=0.1311

b) mean=2.4

c)This is a Binomial with n = 16 with p = 0.15

P(X 4) = 1 - P(0) - P(1) - P(2) - P(3)

Using the Binomial Formula ...

Answer = 1 - 0.78989 = 0.21011

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