7.3/7.4 - Mean and Variance of PGF's/Sums of independent variables
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4 Terms
1
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What’s the general formula for E(X)
E(X)=G’x(1)
2
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What’s the general formula for Var(X)
Var(X)=G’’x(1)+G’x(1)-(G’x(1))²
3
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if Z=X+Y, what’s the general formula for Gz(t) in terms of X and Y
Gz(t)=Gx(t)*Gy(t)
4
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