stats discussion normal distrubution
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11. The ages of commercial aircraft are normally distributed with a mean of 13.0 years and a standard deviation of 7.0987 years. What percentage of individual aircraft have ages between 9 years and 15 years? Assume that a random sample of 49 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?
-The percentage of individual aircraft that have ages between 9 years and 15 years is
-The percentage of sample means that have ages between 9 and 15 years is…?
12. Suppose certain coins have weights that are normally distributed with a mean of 5.011g and a standard deviation of
0.054g. A vending machine is configured to accept those coins with weights between 4.921g and 5.101g.
–If 290 different coins are inserted into the vending machine, what is the expected number of rejected coins?
The expected number of rejected coins is…..?
-Which results is more important to the owner of the vending machine? Why?
Part (b) because rejected coins could mean lost sales.
Part (a) because rejected coins could mean lost sales.
Part (b) because the average result is more important.
Part (a) because the average result is more important.
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