MAT 232 Statistical Literacy

 

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.)