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

P(X<=2)
=P(X=0)+P(X=1)

=0.5+0.3
=0.8