Alternative Equation Formats

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MathML

{\hat{σ}}^{2} = \frac{\sum_{i = 1}^{n} W_{i} (X_{i} - \bar{X})^{2}}{\sum_{i = 1}^{n} W_{i}}

\[ {\hat\sigma }^{2}=\frac{\sum _{i=1}^{n} W_{i}(X_{i}-\bar{X})^{2}}{\sum _{i=1}^{n} W_{i}} \]