The means and mean absolute deviations of Sidney’s and Phil’s grades are shown in the table. Means and Mean Absolute Deviations of Sidney’s and Phil’s Grades Sidney Phil Mean 82 78 Mean Absolute Deviation 3 point 2 8 3 point 9 6 Which expression represents the ratio of the difference of the two means to Sidney’s mean absolute deviation?
The difference between the means is 82 − 78 = 4. Sidney’s mean absolute deviation is 3.28, so the requested ratio is 4 ÷ 3.28, represented by choice D, “4 over 3.28.”
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