# What is the formula of variance by step deviation method

We use the following formula to calculate standard deviation using step deviation method.

$S\mathrm{tan}darddeviation=\sqrt{\frac{{\sum}_{}f{d}_{x}^{I}}{N}-{\left(\frac{{\sum}_{}f{d}_{x}^{I}}{N}\right)}^{2}}\times h$

**Variance**is nothing but

**Standard Deviation squared**. Hope that this clears your doubt.

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