plz help to me, actually I cant find out how to got ans.
the pdf is given as
f(x, y) = 2, if (x,y) є R
there is marginal pdf's of X and Y
E(X) = integral 0 to 1, x2(1-x)dx = 1/3
now can you describe this stepwise
E(X) = mathemetical expectation
becoz I cant analyse it