已知随机变量X服从泊松分布,且D(X)=1,则p{X=1}=____.
1/e。 解析:泊松分布芳差D(X) =λ=1 又泊松分布律为P{X=i}=λie-λ/i! (i=0,1,…) 则有P { X=1}=e=-1=1/e
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