- #1

mathman

Science Advisor

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## Summary:

- Interesting formula for variance

## Main Question or Discussion Point

I derived (trivially) an expression for the variance of a random variable (which I had never noticed before). Let ##X## be a random variable with cdf ##F(x)## then (assuming finite second moment). ##Var(X)=\frac{1}{2}\int\int (x-y)^2dF(x)dF(y)##.

Is this expression of any use?

Is this expression of any use?

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