Posted by **tony** on Sunday, March 17, 2013 at 9:12pm.

The average age of a vehicle registered in the United States is 8 years, or 96 months. Assume the standard deviation is 16 months. If a random sample of a group of 48 vehicles is selected find the probability that the mean of the groupâ€™s age is between 90 and 100 months.

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