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A bank branch located in a commercial district of a city has developed an improve…continues

A bank branch located in a commercial district of a city has developed an improved process for serving customers during the noon-1:00pm lunch peoriod. The waiting time(defined as the time the customer enters the line unti he or she reaches the teller window) of all customers during this hour is recorded over a period of 1 week. Arandom sample of 15 customers is selected, and the results are as follows

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