Posted by **kevin** on Thursday, April 25, 2013 at 1:42pm.

The duration of time it takes General Motors to build a car is normally distributed with a mean of 31 hours and a standard deviation of 2 hours.

a) What is the probability that a single car, selected at random,

will take between 28 and 34 hours?

b) What is the probability that the mean of the times for a sample

of 25 cars will be between 28 and 34 hours?

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