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coefficient error Tag: Reverted |
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&= \frac{\operatorname{E}[X^3] - 3\mu\operatorname E[X^2] + 3\mu^2\operatorname E[X] - \mu^3}{\sigma^3}\\
&= \frac{\operatorname{E}[X^3] - 3\mu(\operatorname E[X^2] -\mu\operatorname E[X]) - \mu^3}{\sigma^3}\\
&= \frac{\operatorname{E}[X^3] - 3\mu\sigma^2
\end{align}
</math>
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