正确求解 (2)P(H1=x12…X1o=x0) ∏cwp3(1-p)x 10N-∑x10 p(1-p)∏ 个4 0,1,…,N,i=1,2,…,10 (3)E(X)=Np E(S2)=Np(1-p)(2)   = − = −  −  = = − = = = = 1 0 1 1 0 1 0 1 1 1 1 0 1 0 1 0 1 1 0 1 (1 ) (1 ) ( , , ) i x N x N x i x x N x N i i i i i i i i p p C C p p P X x  X x x = 0,1,  ,N, i =1,2,  ,10. i (3) E(X ) = N p ( ) (1 ) 2 E S = N p − p 正确求解