i've been trying to prove for hours that $\displaystyle \mu_{3}=\mu'_{3}-3\mu\mu'_{2}+2\mu^3$ where $\displaystyle \mu_{3}=E[(X-E(X))^3]$ and I cannot do it. Does anyone know how I can prove this? thanks.

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- Oct 17th 2009, 07:45 AMi_zz_y_ill[SOLVED] proof of coefficient of skewness
i've been trying to prove for hours that $\displaystyle \mu_{3}=\mu'_{3}-3\mu\mu'_{2}+2\mu^3$ where $\displaystyle \mu_{3}=E[(X-E(X))^3]$ and I cannot do it. Does anyone know how I can prove this? thanks.