设某人进行独立重复射击,每次击中目标的概率为p,-|||-令X表示首次击中目标时射击的次数,X1,X2,···,xn-|||-是来自X的样本,则参数p的矩估计量为 ()-|||-(10分)-|||-A hat (p)=2overline (X)-|||-B hat (p)=dfrac (1)(2overline {F)}-|||-C hat (p)=dfrac (1)(overline {X)}-|||-D hat (p)=overline (Y)