X Y
1
xy, 0 d" x d" 2, 0 d" y d" 3
9
f(x, y) =
0
P (X < 1,5) P (Y > 2) P (X + Y > 1) P (X > Y )
X Y
2(x + y - 2xy), 0 d" x d" 1, 0 d" y d" 1
f(x, y) =
0
X Y X Y
X Y
2ąye-ąx, 0 d" x d" ", 0 d" y d" 1, ą > 0
f(x, y) =
0
X Y
X Y
6 xy
(x2 + ), 0 < x < 1, 0 < y < 2,
7 2
f(x, y) =
0
X
P (X > Y )
1 1
P (Y > |X < )
2 2
E(X)
E(Y )
 N1
N2
N1 N2
p X1
X2
X1 X2
X Y
1 1 1 1
p(1, 1) = , p(1, 2) = , p(2, 1) = , p(2, 2) = .
8 4 8 2
P (X|Y = i), i = 1, 2
X Y
Cov(X, Y )
P (XY d" 3) P (X + Y > 2) P (X/Y > 1)