Examples finding expected value of a constant: E(a) = a, and expected value of X: E(X)

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Proof that expected value of sum of random variables is the sum of expected values: E(X+Y)=E(X)+E(Y)
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Proof for the variance of a sum of random variables: Var(X+Y)=Var(X)+Var(Y)+2Cov(X,Y)
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