... 23 6 33 6 Y 1 2 3 PY 23 6 33 6 136 c) µ =X2 .33 , µ =Y1. 83, σ =2X0.555, σ =2Y0.4 72. d) =cov(X, Y) 0.0 139 , ρ =(X, Y) 0. 027 . Bài 12. a) X 0 1 2 3 PX 0. 125 0 .37 5 0 .37 5 0. 125 Y 0 1 2 3 ... 0. 125 , ρ = −(X, Y) 0.15 02. Bài 10. a) µ = −X0.467, µ =Y0, =cov(X, Y) 0, ρ =(X, Y) 0. b) X và Y độc lập. Bài 11. a) Y X 1 2 3 1 23 6 33 6 136 2 436 636 23 6 3 636 936 33 6 b) X 1 2 3 PX 136 23 6 ... −πX1 12, π −σ =π2X 23, ( )( )π ≤ ≤= <>1sin x khi 0 x2F x 0 khi x 011 khi x2. d) =A 3, µ =X 32 , σ =2X34, ( )− ≥=< 31 1 khi x 1F xx0 k hi x 1. Bài 2. a) =3k64, 1 2 3 40.10 .20 .30 .4....