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

the ages of commercial aircraft are normally distributed with a mean of 13.5years and a standard deviation of 7.1922 years. what percentage of individual aircraft have ages between 10years and 15years? Assume that a random sample of 100 aircraft is selected and the mean age of the sample is computed. what percentage of individual aircraft that have ages between 10years and 15years? secondly, what percentage of sample means that have ages between 10years and 15years?

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