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

Past experience indicates that the variance in the time it takes for a "fast lube" operation to actually complete the lube and change for customers is 9.00 minutes. The manager wishes to estimate the mean time with 99 percent confidence and a margin of error of plus or minus 0.50 minutes. Given this, what must the sample size be?

a) n = 1245

b) b=239

c) n=2149

d) n=139

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