The Mean deviation reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Mean deviation

The mean deviation is a measure of Statistical dispersion, obtained by taking the mean of the absolute deviations of a data set from its mean value.

The formula for the mean deviation, M, of a dataset x₁, x₂,...,x_n is:

Here is the Mean of the dataset, obtained from the following formula:

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