R is a random variable such that R {10, 20, 70,100}. Given that P(R = r) is

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R is a random variable such that R ∈{10, 20, 70,100}. Given that P(R = r) is proportional to r, show that E(R) = 77 and find Var(R).

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Cambridge International AS & A Level Mathematics Probability & Statistics 1 Coursebook

ISBN: 9781108407304

1st Edition

Authors: Dean Chalmers, Julian Gilbey

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Question Posted: Sep 13, 2021 03:07 AM

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R is a random variable such that R {10, 20, 70,100}. Given that P(R = r) is

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The expected value of a random variable R is given by ER r PR r where ...View the full answer

Cambridge International AS & A Level Mathematics Probability & Statistics 1 Coursebook

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