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The shape of the distribution of the time required to get an oil change at a 10-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 10-minute oil-change facility is unknown. However, records indicate that the mean time for an oil change is 11.4 minutes and the standard deviation for oil change time is 3.2 minutes.

(a) To compute the probabilities regarding the sample mean using the normal model, what sample size would be required?

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