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 40 of these cars. What is the probability that the average mileage of the fleet is greater than 27.8 mpg? 0.5948 0.0643 0.9357 0.4052
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Since the standard deviation of a single car is 5 mpg, the standard deviation of the mean for 40 cars is: $\frac{5}{\sqrt{40}}$ Now, we need to find the z-score for 27.8 mpg. The z-score is the number of standard deviations away from the mean. We can calculate Show more…
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