Hey, i'm having a little trouble transitioning from single variable probability distributions to bivariate distributions, I'm just wondering if any of you guys have a minute to look over my solution to a question to make sure i'm not going astray on the foundation?

Thanks for your help!

So for we need to find .Quote:

For the given Joint Probability Mass Function over the nine points with and , Determine and

From here,

Now onto the variance;

Have I gone horribly wrong somewhere? Or does this look like the appropriate approach? Thanks for helping me understand this!

Kasper