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===Total Variance=== | ===Total Variance=== | ||
<math>Var(Y) = E(Var(Y|X)) + Var(E(Y | X)</math><br> | <math>Var(Y) = E(Var(Y|X)) + Var(E(Y | X))</math><br> | ||
This one is not used as often on tests as total expectation | This one is not used as often on tests as total expectation | ||
{{hidden | Proof | | {{hidden | Proof | | ||