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Statement of a problem № m748

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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. a. What is the likelihood of exactly four purchases? b. How many purchases should she expect? c. What is the likelihood that four or more “hits” result in a purchase?

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

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