The Number of Cars Passing Through a Tim Hortons "Drive-Thru

The number of cars passing through a Tim Hortons "drive-thru" during each 15-minute period was recorded.The results are shown below. 20 22 20 23
23 20 25 22
30 26 26 24
19 26 20 15
10 22 22 22

A) 20 cars
B) 23 cars
C) 22 cars
D) 21.85 cars
E) 26 cars