Alan bowls one game, which consists of 10 frames. The number of pins he knocked down in each frame is 5, 6, 7, 5, 7, 9, 2, 4, 8, and 7. Alan finds that the mode of the number of pins he knocked down is 7. Which measure of the data did he find?
A. a measure of center
B. a measure of variation
C. a measure of neither variation nor center
D. a measure of both variation and center
