Question

A principal asked 5 seventh grade students and 5 eighth grade students the number of books they read over the summer. The results are in the table below.

What is the difference in the mean absolute deviation of books read by seventh grade students and mean absolute deviation or books read by eighth grade students?

A. 2
B. 1
C. 0.80
D. 0.48

Answer 1

The Mean Absolute Deviation (MAD) of a set of data is the average distance between each data value and the mean. The mean absolute deviation is the "average" of the "positive distances" of each point from the mean. The larger the MAD, the greater variability there is in the data (the data is more spread out).