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GATE 2021 ST – Question 57

Probability · Random Variables and Transforms · 2 marks · Numerical answer

X has MGF M(t)=(e^t−1)/[t(1−t)] for t<1,with the continuous value at t=0. Find P(X>1),to two decimals.

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Correct answer: 0.60 to 0.66

Explanation

The MGF factors into those of independent U∼Uniform(0,1) and E∼Exp(1),so X has the law U+E. Conditional on U=u,P(U+E>1)=e^(−(1−u)). Integrate over u∈(0,1) to obtain 1−e⁻¹≈**0.63**.

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