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What is E(X) for the number of heads in two fair coin tosses?
A2
B1
C1/2
D3/2
Answer & Solution
Correct answer: B. 1
Using probabilities 1/4, 1/2, 1/4 for 0, 1, 2 heads gives 0 + 1/2 + 1/2 = 1.
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