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

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Statistics

A study of the amount of time it takes a mechanic to rebuild thetransmission for a 2005 Chevrolet Cavalier shows that the mean is8.6 hours and the standard deviation is 2.1 hours. If 36 mechanicsare randomly selected, find the probability that their mean rebuildtime exceeds 8.9 hours.

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