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The ages of commercial aircraft are normally distributed with a mean of 14.0 years and a standard deviation of 7.7 years. What percentage of individual

The ages of commercial aircraft are normally distributed with a mean of 14.0 years and a standard deviation of 7.7 years. What percentage of individual aircraft have ages greater than 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 greater than 16 years?

The percentage of individual aircraft that have ages greater than 16 years?

The percentage of sample means that have ages greater than 16 years?

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