February 28, 2017

Homework Help: statistics

Posted by Tanya on Tuesday, April 24, 2012 at 8:26pm.

The ages of commercial aircraft are normally distributed with a mean of 13.0 years and a standard deviation of 7.5 years what percentage of individual aircraft have ages greater than 15 years assume that a random sample of 49 aircraft is selected and the mean age of the sample is computed. What percentage of sample means have ages greater than 15 years

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