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Rin incorrectly calculated the mean absolute deviation for the data set 25,25,31,36,38.Her work is shown here.

1. Find the mean.

Mean =
25 + 25 + 31 + 36 + 38
5
=
155
5
= 31

2. Find each absolute deviation.

Absolute deviations:6,6,0,5,7

3. Find the mean absolute deviation.

MAD =
6 + 0 + 5 + 7
4
=
18
4
= 4.5

In which step did Rin make an error?