What is the probability that at least 6 of the 15 people will make a purchase?

You are the manager of a high-end ladies fashion store. For the past few months you have been gathering data and found that 45% of persons entering the store actually make a purchase.

a. If 15 people enter the store, what is the probability that 9 of them will make a purchase?

b. What is the probability that at least 6 of the 15 people will make a purchase?

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