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Math Help - Obtain the cov(X,Y+Z)

  1. #1
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    Obtain the cov(X,Y+Z)

    Question : For random variables X,Y and Z, it is given that

    Cov(X,Y) = a and Cov(X,Z) = c

    Obtain Cov(X,Y+Z)
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  2. #2
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    Quote Originally Posted by zorro View Post
    Question : For random variables X,Y and Z, it is given that

    Cov(X,Y) = a and Cov(X,Z) = c

    Obtain Cov(X,Y+Z)
    You have got to start reading and understanding your class notes and textbook! Many of the questions you are posting are done using basic definitions and formulae. MHF is not a service for doing all your homework.

    This question is nothing more than applying a basic formula:

    Cov(X, Y + Z) = Cov(X, Y) + Cov(X, Z).

    See here: Covariance - Wikipedia, the free encyclopedia
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  3. #3
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    Thanks Mr fantastic and sorry for annoying u

    Quote Originally Posted by mr fantastic View Post
    You have got to start reading and understanding your class notes and textbook! Many of the questions you are posting are done using basic definitions and formulae. MHF is not a service for doing all your homework.

    This question is nothing more than applying a basic formula:

    Cov(X, Y + Z) = Cov(X, Y) + Cov(X, Z).

    See here: Covariance - Wikipedia, the free encyclopedia

    Thanks for the reply and sorry for annoying u
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