# Variance or second moment about the Mean

LaTeX Code:

\sigma ^2 = \mu _2 = \sum {\left( {x - \mu _1 } \right)^2 P\left( x \right)}

MathType 5.0 Code:

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Pasting the above "text" into MathType 5.0 will enter the above equation and make it possible to edit, save, and use in applications such as MS Word.