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A medical devices company wants to know the number of hours its MRI machines are used per day. A previous study found a standard deviation

A medical devices company wants to know the number of hours its MRI machines are used per day. A previous study found a standard deviation of six hours. How many MRI machines must the company find data for in order to have a margin of error of at most 0.10 hour when calculating a 98% confidence interval?

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