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Percentage of Complete Full Service Oil Changes

The length of time to do a complete full service oil change at Speedy-Lube is normally distributed with a mean of 15.8 minutes and a standard deviation of 2.2 minutes.

What percentage of complete full service oil changes will take less than 10 minutes? If 1000 cars had a complete full service oil change, how many would you expect to be finished in more than 20 minutes?

Solution Summary

This solution provides calculations in Excel for percentage of complete full service oil changes.

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