Question: Past experience indicates that the standard deviation in the time it takes for a fast lube operation to actually complete the lube and oil change

Past experience indicates that the standard deviation in the time it takes for a "fast lube" operation to actually complete the lube and oil change for customers is 3.00 minutes. The manager wishes to estimate the mean time with 99% confidence and a margin of error of 0.50 minutes. Given this, what must the sample size be?

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