Mark bought a new car and wanted to see the accuracy of the highway and city mileage. he recorded the average mpg for nine different trips on the highway and in the city and created the graph shown to analyze the distribution.

which statement correctly compares the distributions?
a) at one time he got 50 more mpg in the city than on the highway.

b) when driving on the highway he gets 22 mpg more than when driving in the city.

c) on average the gas mileage in the city was about 4 mpg less than that on the highway.
d) on average, the gas mileage in the city was about 4 mpg better than that on the highway.