f(x, y) = (3x2 + 4ry) for 0 x

(3x2+4.ey) for 0 and 0 S y < 1 1. What is the probability that X 2.8 and Y 0.9? 0.73 O 0.02 O 0.62 O 0.37 O 2. Compute the marginal pdf f(x) of X. Specifically, what are a and b in f(x) -L(ax2 4- bx)? O O a=12, a=10, 3. Compute the marginal pdf f(y) of Y. Specifically, what are a and b in O O O O a-I, b=15 a=9, b=14 a=27, b=18 a=13, 4. What is the expected value E(X+Y)? O 0.351 1.65 O 3.494 O 2.729 O 0.442 O