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Mean Deviation

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☼ Mean Deviation ( $\delta_{\overline{x}}$ ) :

(i) Ungrouped Data : –

$\delta_{\overline{x}}$ = $\frac{\sum \left | x_{i}- \overline{x} \right |}{n}$

Where, n = Number of observations

(ii) Discrete Data ( Grouped Data ) : –

$\delta_{\overline{x}}$ = $\frac{\sum f_{i} \left | x_{i}- \overline{x} \right |}{n}$

Where, n = $\sum f_{i}$