The means and mean absolute deviations of the individual times of members on two 4 times 400 –meter relay track teams are shown in the table. Means and Mean Absolute Deviations of Individual Times of Members of 4 times 400 –meter Relay Track Teams Team A Team B Mean 59 point 3 2 s 59 point 1 s Mean Absolute Deviation 1 point 5 s 2 point 4 s What is the ratio of the difference in the means of the two teams to the mean absolute deviation of Team B?
The difference between the teams’ means is 59.32 − 59.1 = 0.22 seconds. Divide this difference by Team B’s mean absolute deviation: 0.22 ÷ 2.4 ≈ 0.09. The ratio is 0.09, choice C.
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