in a study of the gasoline mileage of model year 2017 automobiles, the mean miles per gallon was 27.5 and the median was 26.8. the smallest value in the study was 12.70 miles per gallon, and the largest was 50.20. the first and third quartiles were 17.95 and 35.45 miles per gallon, respectively. develop a box plot and comment on the distribution. is it a symmetric distribution?