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Question 1015:

Suppose that the number of customers who enter a supermarket each hour is normally distributed with a mean of 570 and a standard deviation of 170. The supermarket is open 18 hours per day. What is the probability that the total number of customers who enter the supermarket in one day is greater than 11000? (Hint: Calculate the average hourly number of customers necessary to exceed 11000 in one 18-hour day.)

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