X and Y are not independent random variables If Var[X+Y]=3, Var[X-Y]=1, E[X]=1 and E[Y]=2, thenwhat is E[XY]?

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what is E[XY]?

Algebra: Structure And Method, Book 1

(REV)00th Edition

ISBN:9780395977224

Author:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole

Publisher:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole

Chapter11: Rational And Irrational Numbers

Section: Chapter Questions

Problem 23CLR

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X and Y are not independent random variables

If Var[X+Y]=3, Var[X-Y]=1, E[X]=1 and E[Y]=2, then
what is E[XY]?

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