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Probability formula
2022-07-07 03:36:00 【wmzjzwlzs】
variance D(x+y)=D(x)+D(y)+2Cov(x,y)=D(x)+D(y)
covariance Cov(x,y)=E(xy)-E(x)E(y), Independent random variables x,y Satisfy E(xy)=E(x)E(y)
So random variables xy Against each other when ,D(x+y)=D(x)+D(y)
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