The owner of a small deli is trying to decide whether to
discontinue selling magazines. He suspects that only 9% of his
customers buy a magazine and he thinks that he might be able to use
the display space to sell something more profitable. Before making
a final decision, he decides that for one day he will keep track of
the number of customers that buy a magazine.
(a) Explain why this is a binomial experiment.
(b) Assuming his suspicion that 9% of his customers buy a magazine
is correct, what is the probability that exactly 2 out of the first
12 customers buy a magazine? Give your answer as a decimal number
rounded to two digits.
(c) What is the expected number of customers from this sample that
will buy a magazine?
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