The means and mean absolute deviations of the amount of rain that fell each day in a local city, last week and this week, are shown in the table. Means and Mean Absolute Deviations of Rainfall Last Week and This Week Last Week This Week Mean 19 point 7 cm 19 point 3 cm Mean Absolute Deviation 4 point 6 cm 5 point 2 cm The difference in the mean rainfall is approximately what percent of the mean absolute deviation of the this week’s rainfall?
The difference between the means is 19.7 − 19.3 = 0.4 cm. Compare this with this week’s mean absolute deviation: (0.4 ÷ 5.2) × 100 ≈ 7.7%, which rounds to 8%. Therefore, the correct choice is 8 percent.
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