Recent content by cg7193

  1. C

    Covariance - Bernoulli Distribution

    ok ill give it a go now, thank you so much!
  2. C

    Covariance - Bernoulli Distribution

    Cov(XY)=E(XY) - E(X)E(Y) if I am not mistaken? sorry I am being slow but i don't understand how you get E(Y|X=1) into terms of p and q
  3. C

    Covariance - Bernoulli Distribution

    yep then i get that the original equation its what to do after, am i expecting an answer in terms of p and q? so i understand that the part E(XY|X=0) = 0 (!) and that E(XY|X=1) = 1*E(Y|X=1) so does that mean I am left with E(XY)=E(Y|X=1) ?? its from here i am stuck, sorry if I am completely...
  4. C

    Covariance - Bernoulli Distribution

    Easiest thing in the world: E(XY|X=0) = 0 (!) E(XY|X=1) = 1*E(Y|X=1) from this help that you got what do you do, what's the final answer?
  5. C

    Covariance - Bernoulli Distribution

    I think I am being really stupid here but for the E(XY) part can you write down the full working I am really stuck on it, thanks
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