AVEDEV(n1, n2, ...)
AVEDEV returns the average of the absolute deviations of a data set from their mean.
Let us assume that the cells A1, A2, ..., A5 contain numbers 11.4, 17.3, 21.3, 25.9, and 40.1. Then
AVEDEV(A1:A5) equals 7.84.
STDEV.