1. The problem statement, all variables and given/known data Let f(x,y) = 24xy where x=[0,1], y=[0,1], x+y=[0,1] Find E[X] and E[Y] 2. Relevant equations E[X] = the integral from neg. infinity to positive infinity of x * f_X(x) dx where f_X is the marginal density function of X. 3. The attempt at a solution f_X is found by integrating f(x,y) in terms of dy over the span of neg. infinity to positive infinity. For the integral, I used the boundaries 0 and 1. Solution guides online suggest that the marginal density function f_X is equal to 24x.