设随机变量X服从参数为4的泊松分布,则下列结论中正确的是
A.E(X)=0.5,D(X)=0.5
B.E(X)=0.5,D(X)=0.25
C.E(X)=2,D(X)=4
D.E(X)=4,D(X)=4
正确答案是D
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