离散型随机变量X的取值为-1,0,1,已知D(X)=5/9,E(X)=1/3,则P{X=0}=

问题描述:

离散型随机变量X的取值为-1,0,1,已知D(X)=5/9,E(X)=1/3,则P{X=0}=