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.)
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