概率论提高概率论与数理统计随机推荐probability-statistics-2:概率论:6:第6讲-数字特征:选择题:8:49:1选择题数字特征不看本题本题讨论已掌握查看解析收入错题#10906设随机变量 (X,Y)\left({X,Y}\right)(X,Y) 服从二维正态分布 N(0,0;1,4;−12)N\left({0,0;1,4; - \frac{1}{2}}\right)N(0,0;1,4;−21),则下列随机变量中服从标准正态分布且与 XXX 独立的是‾\underline{\qquad}.A. 55(X+Y)\frac{\sqrt{5}}{5}\left({X + Y}\right)55(X+Y)B. 55(X−Y)\frac{\sqrt{5}}{5}\left({X - Y}\right)55(X−Y)C. 33(X+Y)\frac{\sqrt{3}}{3}\left({X + Y}\right)33(X+Y)D. 33(X−Y)\frac{\sqrt{3}}{3}\left({X - Y}\right)33(X−Y)