Homework Statement
Let the random variables X and Y have the joint p.m.f.:
f(x,y) = (x+y)/32 x=1,2, y=1,2,3,4.
find the means \mux and \muy, the variances \sigma2x and \sigma2y, and the correlation coefficient \rho.
Homework Equations
\rho=(COV(X,Y))/\sigmax\sigmay
The Attempt...