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# Mean Deviation Assignment Help

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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 x_{1}, x_{2}........x_{n }are the values of a variable then

**MD = 1/n Σ |X**_{i} - A|

**Grouped data:** If x_{1}, x_{2}, .......... x_{n} are the values of a variable with frequencies f_{1}, f_{2}, .............f_{n} then

**MD = 1/N Σ f**_{i}|X_{i} - A|

where A may be mean or median or mode:

co-efficient of MD = MD/A

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**Statistics >> Mean Deviation**

**Ungrouped data:**[f x

_{1}, x

_{2}........x

_{n }are the values of a variable then

**MD = 1/n Σ |X**A|

_{i}-**Grouped data:**If x

_{1}, x

_{2}, .......... x

_{n}are the values of a variable with frequencies f

_{1}, f

_{2}, .............f

_{n}then

**MD = 1/N Σ f**A|

_{i}|X_{i}-

**Statistics Assignment Help - Statistics Homework Help, Live Tutor 24x7**