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Y V r È ¸ _ 5 é N E ì Z Œ i â ä Æ ß v Z i ¸ z {à V Ì = ‰ z {i V Ì =!Var(X) = E(X2)−E2(X), (2) the second moment minus the square of the first moment We usually denote the variance by σ2 = Var(X) and when necessary (to avoid confusion) include X as a subscript, σ2 X = Var(X) σ = p Var(X) is called the standard deviation of X For any rv X and any number a E(aX) = aE(X), and Var(aX) = a2Var(X) (3)New Hampshire State Government Employees Top 25 Pensions Name NADEAU, DAVID, E HILL, DONALD, S BUCKLEY, MICHAEL, L MARSHALL, JAMES, F GOODWIN, HARVEY, S Scriptsource Entry Phonetic Symbol Guide ŽÄŒ¢ ‚©‚í‚¢‚¢ Œ¢ ƒCƒ‰ƒXƒg Žè'‚« ŠÈ'P