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Minimizing Variance
Goldman Sachs
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xxxxx xxx xxxxxxxxxxx xxxxxx xxxxxxxxx \(x_x\) xxx \(x_x\) xxxx xxxxxxxxx xx xx xxx xxx, xxxxxxxxxxxx, xxxx xxx xxxxx xx \(x \xxx x \xxx x\) xxxx xxxxxxxxx xxx xxxxxxxx xx \(x = xx_x + (x-x)x_x\).

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