A research worker wants to determine the average time it takes a mechanic to rot...
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A research worker wants to determine the average time it takes a mechanic to rotate the tires of a car, and she wants to be able to assert with 95% confidence that the mean of her sample is off by at most 0.50 minute. If she can presume from past experience that σ = 1.6 minutes, how large a sample will she have to take? Give your answer rounded off to the nearest integer.
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