The variance of the number obtained in a single throw of a fair six-faced die isA7/2B35/12C91/6D17/6 Correct answer: B ExplanationE(X) = 7/2 and E(X²) = 91/6, so Var(X) = 91/6 − 49/4 = 35/12 ≈ 2.92. Join the discussion Report an error