(1)设随机变量X的分布列P(X=k)=α/3k,k=0,1,2…,则α=____.
(2)设随机变量X的分布列P(X=k)=αe-k,k=0,1,2…,则α=____.
(1)设随机变量X的分布列P(X=k)=α/3k,k=0,1,2…,则α=____.
(2)设随机变量X的分布列P(X=k)=αe-k,k=0,1,2…,则α=____.
【正确答案】:(1)2/3;(2)1-1/e
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