mean = sum of x*P(x) = 2x0.50 + 8x0.30 + 10x0.20 = 5.40 variance = sum of x^2*P(x) - mean^2 = 2^2*0.50 + 8^2*0.30 + 10^2*0.20 - (5.40)^2 = 2.00 + 19.20 + 20.00 - 29.16 = 12.04 I hope you understand how the answer came out. Lee
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