1 单选 (10分) 设(x1,x2,···,xn)是来自两点分布B(1,p)总体的样本,则-|||-当样本容量n充分大时,样本均值 overline (X)=dfrac (1)(n)sum _(i=1)^n(X)_(i) 近似服从的分-|||-布是 () .-|||-A. N(np,np(1-p))-|||-bigcirc B.B(n,p)-|||-C c. (p,dfrac (p(1-p))(n))