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Expectations - University of Notre Dame

V(X) = E[(X - )2] = E(X 2)− 2 = x In the discrete case, this is equivalent to ... expectations E( X ) - 2 E(X) + 2 = X X 2 µ µ Rule 5: E(aX) = a * E(X), i.e. Expectation of a constant times a variable = The constant times the expectation of the variable; and Rule 4: E(a) = a, i.e. Expectation of a constant = the constant

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