8) A certain car model has a mean gas mileage of 29 miles per gallon (mpg) with a standard deviation 5 mpg. A pizza delivery company buys 47 of these cars. What is the probability that the average mileage of the fleet is between 27.9 and 29.3 mpg?
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The standard error is the standard deviation divided by the square root of the sample size. In this case, the standard deviation is 5 mpg and the sample size is 47 cars. So, the standard error is 5 / sqrt(47) = 0.73 mpg. Show more…
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