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X takes 1, 2, 3 with probabilities 0.2, 0.5, 0.3. Find E(X).
A2.1
B2.0
C1.9
D2.2
Answer & Solution
Correct answer: A. 2.1
E(X) = 1(0.2) + 2(0.5) + 3(0.3) = 0.2 + 1.0 + 0.9 = 2.1.
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