查看原题
设 $X$ 是随机变量, $x_0$ 为任意实数, $E(X)$ 是 $X$ 的数学期望, 则正确的选项是
A. $E\left(X-x_0\right)^2=E[X-E(X)]^2$     B. $E\left(X-x_0\right)^2 \geq E[X-E(X)]^2$     C. $E\left(X-x_0\right)^2 < E[X-E(X)]^2$     D. $E\left(X-x_0\right)^2=0$         
不再提醒