Ford Motor Company wanted to compare gasoline consumption of 3 different vehicle models using four different kinds of gasoline (RegularSuper RegularUnleadedPremium Unleaded). Each vehicle had gallon of gas added to the empty tank and then driven till empty. The number of miles traveled for all 12 readings are below. Employ the data to compute the mean and median mileages.
S.No

X

1

22.4

2

17

3

19.2

4

20.3

5

20.7

6

19.4

7

20.2

8

19.6

9

21.5

10

20.7

11

21.2

12

20.4
