I know you can use $\sigma^3$ and $\sigma^4$ with $\mu$3 and $\mu$4 respectively to find the skewness and the kurtosis, but by themselves what do they mean + what's the formula to find them?

Thank you in advance!


skewness=$\frac{\mu_3}{\sigma^3}$, kurtosis=$\frac{\mu_4}{\sigma^4}$, where $\mu_k=E((X-\mu)^k)$ and $\sigma^2=E((X-\mu)^2)=E(X^2)-\mu^2$

Using Google:



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