aircraft

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The ages of commercial aircraft are normally distributed with a mean of 13.0 years and a standard deviation of 7.3627 years. What percentage of individual aircraft have ages between
10 years and 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 between 10 years and 15 ​years?
The percentage of individual aircraft that have ages between 10 years and 15 years is nothing
​%. ​(Round to the nearest integer as​ needed.)