To best determine the fuel economy of a car, an automotive technician calculates the mean gas mileage computed for 10 full tanks of gas. a. Use intervals of 0.9 beginning at 19.0 to compute the mean fuel economy (in miles per gallon) from the following data. 21.519.520.620.519.822.322.220.119.321.8 b. At $4.00 per gallon, use the mean fuel economy to calculate the average cost per mile to operate this vehicle. a. The mean fuel economy is mi/gal. (Type an integer or a decimal.)