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概率论公式
2022-07-06 20:23:00 【wmzjzwlzs】
方差D(x+y)=D(x)+D(y)+2Cov(x,y)=D(x)+D(y)
协方差Cov(x,y)=E(xy)-E(x)E(y),相互独立的随机变量x,y满足E(xy)=E(x)E(y)
所以随机变量xy相互对立 时,D(x+y)=D(x)+D(y)
转自:多个随机变量运算后的均值与方差计算_爱吃酸菜鱼的汉堡的博客-CSDN博客_多个随机变量的和的方差
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