8. The ages of commercial aircraft normally distributed with a mean of 13.5 years and a standard deviation of 7.7079 years. What percentage of individual aircraft have ages between 9 years and 16 years? Assume that a random sample of 64 aircraft is selected and the mean age of the sample is computed. What percentage of sample means have ages between 9 years and 16 years? The percentage of individual aircraft have ages between 9 years and 16 years is: %. The percentage of sample means have ages between 9 years and 16 years:

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**Problem:**

The ages of commercial aircraft are normally distributed with a mean of 13.5 years and a standard deviation of 7.7079 years. What percentage of individual aircraft have ages between 9 years and 16 years?

Assume that a random sample of 64 aircraft is selected and the mean age of the sample is computed. What percentage of sample means have ages between 9 years and 16 years?

**Questions:**

1. The percentage of individual aircraft that have ages between 9 years and 16 years is: ______________%.

2. The percentage of sample means that have ages between 9 years and 16 years is: ______________%.
Transcribed Image Text:**Problem:** The ages of commercial aircraft are normally distributed with a mean of 13.5 years and a standard deviation of 7.7079 years. What percentage of individual aircraft have ages between 9 years and 16 years? Assume that a random sample of 64 aircraft is selected and the mean age of the sample is computed. What percentage of sample means have ages between 9 years and 16 years? **Questions:** 1. The percentage of individual aircraft that have ages between 9 years and 16 years is: ______________%. 2. The percentage of sample means that have ages between 9 years and 16 years is: ______________%.
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