单项选择题
已知X 在第i (i=1,2,3,4)年内死亡的概率分布列,如表所示,则2p1=()。
A.1/9B.1/7C.1/4D.0E.4/9
A.0.002765,0.99587B.0.005927,0.99587C.0.005927,0.99683D.0.006887,0.99683E.0.006887,0.99724
A.0.2105B.0.2308C.0.2409D.0.2503E.0.3105
A.0.1451B.0.1652C.0.1754D.0.1857E.0.1959
A.0.9476B.0.9576C.0.9674D.0.9876E.0.9981
A.3/8B.2/9C.3/5D.1/3E.1/7
A.0.98315B.0.97555C.0.97315D.0.98555E.0.97355
A.2/7,35B.3/7,50C.1/7,35D.2/7,50E.3/7,35
A.1.0965B.2.0965C.3.0966D.12.142E.14.142
A.9.7504B.8.7504C.6.7504D.4.7504E.1.7504
A.121B.122C.125D.128E.130