Alternative Equation Formats

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MathML

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

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