rouna
05.11.2019 •
Mathematics
The ages of commercial aircraft are normally distributed with a mean of 12.0 years and a standard deviation of 8.3866 years. what percentage of individual aircraft have ages between 9 years and 15 years? assume that a random sample of 81 aircraft is selected and the mean age of the sample is computed. what percentage of sample means have ages between 9 years and 15 years?
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