设随机变量X~B(4,0.2),则p(X≦3)=请问答案过程设随机变量X~B(4,0.2),则p(X≦3)=

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设随机变量X~B(4,0.2),则p(X≦3)=请问答案过程设随机变量X~B(4,0.2),则p(X≦3)=

设随机变量X~B(4,0.2),则p(X≦3)=请问答案过程设随机变量X~B(4,0.2),则p(X≦3)=
设随机变量X~B(4,0.2),则p(X≦3)=请问答案过程
设随机变量X~B(4,0.2),则p(X≦3)=

设随机变量X~B(4,0.2),则p(X≦3)=请问答案过程设随机变量X~B(4,0.2),则p(X≦3)=
P{x≤3}=P{x=0}+P{x=1}+P{x=2}+P{x=3}
=0.8^4+C(1,4)×0.2×0.8³+C(2,4)×0.2²×0.8²+C(3,4)×0.2³×0.8
=0.4096+0.4096+0.1536+0.0256
=0.9984