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Solve the problem A study of the amount of time it takes a mechanic to...

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Solve the problem A study of the amount of time it takes a mechanic to rebuild the transmission for a 1992 Chevrolet Cavalier shows that the mean is 8 4 hours and the standard deviation is 1 8 hours If 40 mechanics are randomly selected find the probability that their mean rebuild time exceeds 7 7 hours O 0 9634 O 0 9931

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