Alternative Equation Formats

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MathML

s_{w}^{2} = \frac{1}{d} \sum_{i} w_{i} (x_{i} - {\bar{x}}_{w})^{2}

\[ s_{w}^{2} = \frac{ 1 }{ d } \sum _{i} w_{i} ( x_{i} - \overline{x}_{w} )^{2} \]