多维随机变量的问题,如图横线划部分是否应当改为P(X1=-1,X2=1)=P(X1=1,X2=1)=1/2(P(X2=1)-P(X1=0,X2=1))=1/2(1/2-1/2)=0要不然,X1的是由-1,0,1组成的P(X2=1)-P(X1=0,X2=1)应该只等于P(X1=-1,X2=1)与P(X1=1,X2=1)的和对吗?PS
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![多维随机变量的问题,如图横线划部分是否应当改为P(X1=-1,X2=1)=P(X1=1,X2=1)=1/2(P(X2=1)-P(X1=0,X2=1))=1/2(1/2-1/2)=0要不然,X1的是由-1,0,1组成的P(X2=1)-P(X1=0,X2=1)应该只等于P(X1=-1,X2=1)与P(X1=1,X2=1)的和对吗?PS](/uploads/image/z/9924347-11-7.jpg?t=%E5%A4%9A%E7%BB%B4%E9%9A%8F%E6%9C%BA%E5%8F%98%E9%87%8F%E7%9A%84%E9%97%AE%E9%A2%98%2C%E5%A6%82%E5%9B%BE%E6%A8%AA%E7%BA%BF%E5%88%92%E9%83%A8%E5%88%86%E6%98%AF%E5%90%A6%E5%BA%94%E5%BD%93%E6%94%B9%E4%B8%BAP%28X1%3D-1%2CX2%3D1%29%3DP%28X1%3D1%2CX2%3D1%29%3D1%2F2%EF%BC%88P%28X2%3D1%29-P%28X1%3D0%2CX2%3D1%29%29%3D1%2F2%281%2F2-1%2F2%29%3D0%E8%A6%81%E4%B8%8D%E7%84%B6%2CX1%E7%9A%84%E6%98%AF%E7%94%B1-1%2C0%2C1%E7%BB%84%E6%88%90%E7%9A%84P%28X2%3D1%29-P%28X1%3D0%2CX2%3D1%29%E5%BA%94%E8%AF%A5%E5%8F%AA%E7%AD%89%E4%BA%8EP%28X1%3D-1%2CX2%3D1%29%E4%B8%8EP%28X1%3D1%2CX2%3D1%29%E7%9A%84%E5%92%8C%E5%AF%B9%E5%90%97%3FPS)
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