随机变量x的分布律为P(X=0)=0.5,P(X=1)=0.3,P(X=3)=0.2,则P(X
问题描述:
随机变量x的分布律为P(X=0)=0.5,P(X=1)=0.3,P(X=3)=0.2,则P(X
答
P(X<=2)
=P(X=0)+P(X=1)
=0.5+0.3
=0.8