Varians: regneregler?
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Var(aX+b)=a2Var(X)\text{Var}(aX+b) = a^2\text{Var}(X)Var(aX+b)=a2Var(X). Var(X+Y)=Var(X)+Var(Y)+2Cov(X,Y)\text{Var}(X+Y) = \text{Var}(X) + \text{Var}(Y) + 2\text{Cov}(X,Y)Var(X+Y)=Var(X)+Var(Y)+2Cov(X,Y). Uavhengige: Cov=0\text{Cov} = 0Cov=0.
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