3. Suppose that the average fuel economy of new subcompact cars sold in the United States is 35 miles per gallon (mpg). Assume that the standard deviation is 4 miles per gallon. a. Assuming that the mpg distribution is not normal (not bell-shaped), calculate the (minimum) percentage of new cars sold with the following mpg ratings: - Between 27 and 43 - Between 21 and 49 - Within 10 mpg of the mean (above or below) b. If it were reasonable to assume that mpg ratings for new cars followed a bell-shaped (normal) distribution, what can now be said about the percentage of new cars sold with mpg ratings between: - 27 and 43 - 23 and 47