Originally Posted by

**ScienceGeniusGirl** I am having some trouble with multiple variables when one is fixed, and vice versa. I was wondering if someone could please help me - I missed a day of class, and it seems like everything was taught while I was sick!

Anyway, if someone could please explain the following problem, I would really appreciate it!

Let the probability density function of variables X and Y equal

f(x,y) = 1/2 when 0<x<y, 0<y<2 and zero elsewhere. Find the conditional means and variances for each variable when another is fixed and the correlation of X and Y.

Thanks in advance!