Alternative Equation Formats

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MathML

{\bar{x}}_{w} = \frac{\sum_{i = 1}^{n} w_{i} x_{i}}{\sum_{i = 1}^{n} w_{i}}

\[ \bar{x}_ w = \frac{\sum ^ n_{i=1} w_ i x_ i}{\sum ^ n_{i=1} w_ i} \]