What percentage of sample means have ages between 10 years


The ages of commercial aircraft are normally distributed with a mean of 13.5 years and a standard deviation of 8.3821 years. What percentage of individual aircraft have ages between 10 years and 16 years? Assume thata random sample of 64 aircraft is selected and the mean age of the sample is computed. What percentage of sample means have ages between 10 years and 16 years?

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