Mean Deviation Assignment Help

Measures of Dispersion - Mean Deviation

Statistics >> Mean Deviation

Mean Deviation of a set of values is the AM of absolute deviations when deviations are taken from an average A. (usually mean, median or mode)

Ungrouped data: [f x1, x2........xn are the values of a variable then    

MD = 1/n Σ |Xi - A|

Grouped data: If x1, x2, .......... xn are the values of a variable with frequencies f1, f2, .............fn then

        MD = 1/N  Σ  fi|Xi - A|


where A may be mean or median or mode:

                co-efficient of MD = MD/A

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