Thursday
July 24, 2014

Homework Help: stats

Posted by shasha on Tuesday, May 25, 2010 at 8:39pm.

a study of the amount of time it takes a mechanic to rebuild the transmission of 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 8.7 hours.

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