The ages of commercial aircraft are normally distributed with a mean of 12.012.0

years and a standard deviation of 7.40857.4085

years. What percentage of individual aircraft have ages between 1010

years and 1616

?years? Assume that a random sample of 6464

aircraft is selected and the mean age of the sample is computed. What percentage of sample means have ages between 1010

years and 1616

?years?
The percentage of individual aircraft that have ages between 1010

years and 1616

years is

3232?%.

?(Round to the nearest integer as? needed.)The percentage of sample means that have ages between 1010

years and 1616

years is

99.999.9?%.

?(Round to the nearest tenth as? needed.)