3. If X is a discrete random variable and E(X2) = 0, show that P(X = 0)...
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3. If X is a discrete random variable and E(X2) = 0, show that P(X = 0) = 1. Deduce that, if var(X) = 0, then P(X = μ) = 1, whenever μ = E(X) is finite.
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Related Book For 
Probability An Introduction
ISBN: 9780198709978
2nd Edition
Authors: Geoffrey Grimmett, Dominic Welsh
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