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The shape of the distribution of the time required to get an oil change at a 20 -minute oil-change facility is unknown.However, records indicate that

The shape of the distribution of the time required to get an oil change at a

20-minute oil-change facility is unknown.However, records indicate that the mean time is 21.7 minutes, and the standard deviation is 4.2 minutes.

(b) What is the probability that a random sample of n = 35 oil changes results in a sample mean time less than 20 minutes?

The probability is approximately ___

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