As in Example 27.2, a bird lands in a grassy region described as follows: 0 ≤ x, and 0 ≤ y, and x + y ≤ 10. Let X and Y be the coordinates of the bird's landing. Assume that X and Y have the joint density
fX,Y(x, y) = 1/50
for 0 ≤ x and 0 ≤ y and x + y ≤ 10,
and fX,Y(x,y) = 0 otherwise. Find E(V).