Equation (2.28) is often written E(X) = X x xP(X = x) = X x x pX(x),

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Equation (2.28) is often written E(X) =

X x

xP(X = x) =

X x

x pX(x),

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Probability An Introduction

ISBN: 9780198709978

2nd Edition

Authors: Geoffrey Grimmett, Dominic Welsh

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