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The ages of commercial aircraft are normally distributed with a mean of 13.5 years and a...

The ages of commercial aircraft are normally distributed with a mean of 13.5 years and a standard deviation of 7.3905 years. What percentage of individual aircraft have ages between 11 years and 17 years? Assume that a random sample of 64 aircraft is selected and the mean age of the sample is computed. What percentage of sample means have ages between 11 years and 17 years? The percentage of individual aircraft that have ages between 11 years and 17 years is _______ ​%.

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