The ages of commercial aircraft are normally distributed with a mean of 13.0

years and a standard deviation of 7.0029

years. What percentage of individual aircraft have ages between 11

years and 16

years? Assume that a random sample of 100

aircraft is selected and the mean age of the sample is computed. What percentage of sample means have ages between 11

years and 16

years?

The percentage of individual aircraft that have ages between 11

years and 16

years is

nothing

%.

(Round to the nearest integer as needed.)