Homework Answers
a)
X P(X)
0 0.3991
1 0.4605
2 0.1316
3 0.0088
b) E(X) = 0 * 0.3991 + 1 * 0.4605 + 2 * 0.1316 + 3 * 0.0088 = 0.7501
E(X^2) = 0^2 * 0.3991 + 1^2 * 0.4605 + 2^2 * 0.1316 + 3^2 * 0.0088 = 1.0661
V(X) = E(X^2) - (E(X))^2
= 1.0661 - (0.7501)^2
= 0.5034
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