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The ages of commercial aircraft are normally distributed with a mean of 13.5 years and a...

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

13.5 years and a standard deviation of 6.6519 years. What percentage of individual aircraft have ages between

11years and17 years? Assume that a random sample of 49 aircraft is selected and the mean age of the sample is computed. What percentage of sample mean have ages between 11 years and 17 years?

The percentage of means that have ages between 11 years and 17 years is ____ % ( Round to the nearest tenth as needed.)

Math   Statistics-And-Probability   
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