Beta ($\beta$) distribution,貝它分布
$f(x)=\left\{\begin{array}{l}\cfrac{\Gamma(\alpha+\beta)}{\Gamma(\alpha)+\Gamma(\beta)}x^{\alpha-1}(1-x)^{\beta-1}\ \ &,0<x<1\\0\ \ &,o.w\end{array}\right.$
$\mu=\cfrac{\alpha}{\alpha+\beta}$
$\sigma^2=\cfrac{\alpha\beta}{(\alpha+\beta+1)(\alpha+\beta)^2}$
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