Percentage of Complete Full Service Oil Changes
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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?
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This solution provides calculations in Excel for percentage of complete full service oil changes.
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