概率论提高二维随机变量probability-statistics-1:概率论:18:第十八章多维随机变量及其分布:综合题:一-选择题:4:82:1概率统计做题本（一）解答版选择题不看本题本题讨论已掌握查看解析收入错题#8968设 (X,Y)∼N(0,0;12,12;0),Φ(x)\left({X,Y}\right) \sim N\left({0,0;\frac{1}{2},\frac{1}{2};0}\right),\Phi \left(x\right)(X,Y)∼N(0,0;21,21;0),Φ(x) 为标准正态分布函数,则 P{X−Y>E(∣X−Y∣)}=P\{ X - Y > E\left(\left| {X - Y}\right| \right) \} =P{X−Y>E(∣X−Y∣)}=‾\underline{\qquad}.A. 1−Φ(12)1 - \Phi \left(\frac{1}{2}\right)1−Φ(21)B. 1−Φ(2)1 - \Phi \left(\sqrt{2}\right)1−Φ(2)C. 1−Φ(2π)1 - \Phi \left(\sqrt{\frac{2}{\pi }}\right)1−Φ(π2)D. 1−Φ(2π)1 - \Phi \left(\frac{\sqrt{2}}{\pi }\right)1−Φ(π2)