A supermarket has four checkouts in operation. A customer is in a hurry and leaves without making a purchase if all the checkouts are busy. At that time of day the probability of each checkout being free is 0.25. Assume that whether or not a checkout is busy is independent of any other checkout. What is the probability that the customer will make a purchase?
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25 = 0.75 since the probability of all events in a certain space should add up to 1. The probability of all four checkouts being busy is (0.75)^4 = 0.3164. Show more…
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