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A dentist wants to estimate the average number of patients coming into her clinic each day. She estimates the standard deviation is 8 patients per

A dentist wants to estimate the average number of patients coming into her clinic each day. She estimates the standard deviation is 8 patients per day. If the wants to use a random sample of previous days for her sample, how many days should she include to be 90% sure her estimate is off by no more than 0.5 patients per day?

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