라플라스/라플라시안 확률 변수, Laplacian Random Variable
$\displaystyle S_X=(-\infty,\infty)$
$\displaystyle f_X(x)=\frac{\alpha}{2} e^{-\alpha |x|}$
$\displaystyle V[X]=\frac{2}{\alpha^2}$
$\displaystyle f_X(x)=\frac{\alpha}{2} e^{-\alpha |x|}$
$\displaystyle -\infty\lt x\lt\infty,\,\alpha\gt 0$
$\displaystyle E[X]=0$$\displaystyle V[X]=\frac{2}{\alpha^2}$
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