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The shape of the distribution of the time required to get an oil change facility is...

The shape of the distribution of the time required to get an oil change facility is unknown. However, records indicate that the mean time is 21.8 minutes, and the standard deviation is 4.9 minutes.

suppose the manager agrees to pay each employee a $50 bonus if they meet a certain goal. On a typical Saturday the oil change facility will perform 40 oil changes between 10 am and 12pm.Treating this as a random sample there would be a 10% chance of the mean oil change time being at or below what value?
Round to one decimal point as needed

Math   Statistics-And-Probability   
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