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8-39.

Assume that the histograms below represent the amount of time it took two different groups of people to run a K race. Assume that the mean of each histogram is the same. Which group has a greater mean absolute deviation? Why?  

A histogram with 9 bars, with the following heights: 7, 8, 9, 7, 5, 8, 10, 8, 5.
Group A

A histogram with 9 bars, with the following heights: 5, 6, 7, 9, 10, 8, 7, 6, 5.
Group B

Group B has more data points near the center. Group A has more data points farther from the center.