GATE EE 2025 Set 1 — Question 15
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Engineering Mathematics → Probability → Conditional Probability
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Question
Consider discrete random variables and with probabilities as follows:Given , the expected value of is
Correct answer
(B) (1)/(2)
Solution
The conditional expectation of given isStep 1 - marginal probability of :Step 2 - conditional probabilities:Step 3 - expected value:Since takes only the values and , no other terms contribute, so the required expectation is , which is option (B).Answer: (B)
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