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<=2)

Question

X ~ 【0 1 3
0.5 0.3 0.2 】则P(X<=2)

Answer 1

P(X<=2)

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

=0.5+0.3

=0.8

Answer 2

P(X<=2)=P(X=0)+P(X=1)=0.8