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A study of the amount of time it takes a mechanic to rebuild the transmission for...

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Basic Math

A study of the amount of time it takes a mechanic to rebuild thetransmission for a 1992 Chevrolet Cavalier shows that the mean is8.4 hours and the standard deviation is 1.8 hours. If 40 mechanicsare randomly selected, find the probability that their mean rebuildtime exceeds 7.7 hours.

A. 0.8531

B. 0.9634

C. 0.9712

D. 0.9931

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