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Math Help - Covariance of two dependent variables

  1. #1
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    Jan 2010
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    Question Covariance of two dependent variables

    See figure attached for question as well as my attempts.

    I am not concerned with part (a), I have deduced that indeed X and Y are dependent.

    I'm not sure if I have done part (b) correctly, and I am quite certain I have done part (c) incorrectly, but I couldn't think of what else to do.

    Am I on the right track in parts (b) and (c)? What is incorrect, or how should I approach the problem?

    Thanks again!
    Attached Thumbnails Attached Thumbnails Covariance of two dependent variables-probq2.jpg   Covariance of two dependent variables-q-_0181.jpg   Covariance of two dependent variables-q-_0182.jpg   Covariance of two dependent variables-q-_0183.jpg  
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