In a particular retail clothing store, approximately 20% of potential customers who walk into the store make a purchase. In a random sample of 20 customers that walked into the store, (round to 3 significant digits) a. what is the probability that exactly 9 of the customers make purchases? b. what is the probability that at least 2 of the customers make purchases? c. how many of the customers are expected to make purchases? d. what is the standard deviation of t

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