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Calculate the standard error

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Suppose that during any hour at a Fed Mart Department Store, the average number of shoppers is 448, with a standard deviation of 21 shoppers. The Market Research team conducts a random sample of 49 different shopping hours during the month of August.

a. Calculate the standard error of the average.

b. What is the probability that the random sample of shopping hours will yield a mean between 441 and 446 shoppers?

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The expert calculates the standard error for Fed Mart Department Stores.

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