Question: a study shows that the time it takes a mechanic to rebuild the transmission for a 2005 chevrolet cavalier is normally distributed with a mean

a study shows that the time it takes a mechanic to rebuild the transmission for a 2005 chevrolet cavalier is normally distributed with a mean of 8.4 hours and a standard deviation of 1.8 hours.if one mechanic is randomly selected, find the probabilty that his mean rebuild will be less than 8.9 hours

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