Find the mean deviation about the mean for the following data :

7, 8, 4, 13, 9, 5, 16, 18


We have, 7, 8, 4, 13, 9, 5, 16, 18


Mean of the given data is



The respective absolute values of the deviations from the mean , i.e. are


3, 2, 6, 3, 1, 5, 6, 8


Thus, the required mean deviation about the mean is




1