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GATE 2024 ST – Question 61

Joint Distributions · Functions of Random Vectors · 2 marks · Numerical answer

The joint MGF is M_(X,Y)(u,v)=exp(u²/2)/(1−2v)³ for real u and v<1/2. Find E(6X²/Y) to two decimals.

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Correct answer: 1.45 to 1.55

Explanation

The MGF factors, proving independence. X~N(0,1) and Y~Gamma(shape3,scale2). Thus E X²=1 and E(1/Y)=1/[(3−1)2]=1/4. The requested expectation is 6×1×1/4=**1.50**.

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