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The records of a fancy shoe store show that 60% of customers making a purchase pay by credit card. Suppose 10 customers purchased shoes from

The records of a fancy shoe store show that 60% of customers making a purchase pay by credit card. Suppose 10 customers purchased shoes from the store yesterday morning.

i. What is the probability that at most three customers paid by credit card?

ii. What is the expected number of purchases made by credit card?

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