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

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?

The percentage of individual aircraft that have ages greater than 15

years is nothing %.

(Round to the nearest integer as needed.)

The percentage of sample means that have ages greater than 15

years is nothing %.

(Round to the nearest integer as needed.)