Alternative Equation Formats

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MathML

\begin{array}{rcl} {\bar{x}}_{w} & = & \sum_{i = 1}^{n} w_{i} x_{i} / \sum_{i = 1}^{n} w_{i} \\ {\hat{σ}}_{w} & = & \sqrt{\sum_{i = 1}^{n} w_{i} (x_{i} - {\bar{x}}_{w})^{2} / d} \end{array}

Math Rendered as SVG

Math as LaTeX Source

\begin{eqnarray*} \bar{x}_ w & = & \sum _{i=1}^ n w_ i x_ i / \sum _{i=1}^ n w_ i \\ \hat{\sigma }_ w & = & \sqrt{\sum _{i=1}^ n w_ i (x_ i - \bar{x}_ w)^2 / d} \end{eqnarray*}