概率论和数理统计最好有经过.1.设随机变量x和y相互独立,且p(x=1)=p(y=-1)=1/2 ,p(x=1)=p(y=1)=1/2则下列各式成立的是( )A.p(xIy)=1/2 B.p(x=y)=1 C.p(x+y=0)=1/4 D.p(xy=1)=1/42.设随机变量x-n(-3,1),y-n(2,1)是x与y
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![概率论和数理统计最好有经过.1.设随机变量x和y相互独立,且p(x=1)=p(y=-1)=1/2 ,p(x=1)=p(y=1)=1/2则下列各式成立的是( )A.p(xIy)=1/2 B.p(x=y)=1 C.p(x+y=0)=1/4 D.p(xy=1)=1/42.设随机变量x-n(-3,1),y-n(2,1)是x与y](/uploads/image/z/3753476-44-6.jpg?t=%E6%A6%82%E7%8E%87%E8%AE%BA%E5%92%8C%E6%95%B0%E7%90%86%E7%BB%9F%E8%AE%A1%E6%9C%80%E5%A5%BD%E6%9C%89%E7%BB%8F%E8%BF%87.1.%E8%AE%BE%E9%9A%8F%E6%9C%BA%E5%8F%98%E9%87%8Fx%E5%92%8Cy%E7%9B%B8%E4%BA%92%E7%8B%AC%E7%AB%8B%2C%E4%B8%94p%EF%BC%88x%3D1%EF%BC%89%3Dp%EF%BC%88y%3D-1%EF%BC%89%3D1%2F2+%2Cp%28x%3D1%29%3Dp%28y%3D1%29%3D1%2F2%E5%88%99%E4%B8%8B%E5%88%97%E5%90%84%E5%BC%8F%E6%88%90%E7%AB%8B%E7%9A%84%E6%98%AF%28+%29A.p%28xIy%29%3D1%2F2+B.p%28x%3Dy%29%3D1+C.p%28x%2By%3D0%29%3D1%2F4+D.p%28xy%3D1%29%3D1%2F42.%E8%AE%BE%E9%9A%8F%E6%9C%BA%E5%8F%98%E9%87%8Fx-n%28-3%2C1%29%2Cy-n%282%2C1%29%E6%98%AFx%E4%B8%8Ey)
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