Choose the correct option from the given alternative: Find expected value of and variance of X for the following p.m.f. X -2 -1 0 1 2 P(x) 0.3 0.3 0.1 0.05 0.25

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Explanation: E(x) = ∑xipi E(x) = (-2)(0.3) + (-1)(0.3) + (0)(0.1) + (1)(0.05) + (2)(0.25) = -0.6 - 0.3 + 0 + 0.05 + 0.5 = -0.35

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