Calculate the mean deviation from the mean for the following data   6, 7, 10, 12, 13, 4, 8, 20.

Let x̄ be the mean of the given data.

x̄ = (6 + 7 + 10 + 12 + 13 + 4 + 8 + 20) / 8 = 80 / 8 = 10

Computation of Mean Deviation

xi	|di| = |xi - x̄| = |xi - 10|
6	4
7	3
10	0
12	2
13	3
4	6
8	2
20	10
Total	30

Mean deviation = (1/n) Σ|d_i| = 30/8 = 3.75