1( = @ 1( > 2( > 3( 4( > 2( 45 % @ @ > > > @ > > = > 1( 180 2( 162 3 ...
1( = @ 1( > 2( > 3( 4( > 2( 45 % @ @ > > > @ > > = > 1( 180 2( 162 3 ... 1( = @ 1( > 2( > 3( 4( > 2( 45 % @ @ > > > @ > > = > 1( 180 2( 162 3 ...
70XP(x)XP(x)X 2 P(x)−-1141414014002 3Var(x) =2[ ]9 ∑ X P(x) − E(x) = − ( )2 =x8 8 . 2 (13µ = E(x) = ∑ XP(x) =x 898−964. 1 (263=64. 4 (3Cov(x, y) −10r = = = −0/5δxδy4×5. . 4 (41 1 1∑ P(Xi) = 1 ⇒ P(X = 2)= 1−( + + ) =4 3 6µ = E(x) = XP(x) 5000 0/001 2000 0/003 1114∑ = × + × =x. 2 (5. 4 (6. . 3 (7µ = E(x) = ∑ XP(x) = 17xy = ax + b = 2 × 17 −1=331383838[ E(x) ]2= 8 − 2/521/75Var (x) = E(X2) −=218284813898. 1 (8. 2 (9
71Var(y) = a2Var(x) = ( −2)2× 1/75 = 7. 1 1S2= npq = 3×× =2 2 . . 3 (1034. 4 (1111 1 1 1∑ p(x) = 1 ⇒ + a + 1−2a+ = 1⇒+ = a ⇒ a =x 36 3 6 2. 4 (12E(x)= ∑xP(x) = 0×x18+ 1×38+ 2×38E( 2x+ 1)= 2E(x)+ 1=2×1/5 + 1=4 =1E(x2) =2∑ x P(x) = 0×+ 1×x8δ2E(x2x = ) −38+ 3 ×328[ E(x) ]2= 3 −1/52= 0/75V ( 2x+ 5 − 3 2 − 9)= 2V(x)= 2δ2f (x)=Cov(x, y)120−1 < x < 1 1 1 1 x21E(x) =1∫− 1 xdx = × − 1 =2 2 2 431 1E(x ) =3∫ x dx = 0−1238= Cov(x,x2) = E(X3) − E(x)E(x2)−12= = 1/583 1 24+ 4×+ 9×= = 38 8 81= 04. 1 (13. 1 (14. 4 (15. 1 (16
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71Var(y) = a2Var(x) = ( −2)2× 1/75 = 7. 1 1S2= npq = 3×× =2 2 . . 3 (1034. 4 (1111 1 1 1∑ p(x) = 1 ⇒ + a + 1−2a+ = 1⇒+ = a ⇒ a =x 36 3 6 2. 4 (12E(x)= ∑xP(x) = 0×x18+ 1×38+ 2×38E( 2x+ 1)= 2E(x)+ 1=2×1/5 + 1=4 =1E(x2) =2∑ x P(x) = 0×+ 1×x8δ2E(x2x = ) −38+ 3 ×328[ E(x) ]2= 3 −1/52= 0/75V ( 2x+ 5 − 3 2 − 9)= 2V(x)= 2δ2f (x)=Cov(x, y)120−1 < x < 1 1 1 1 x21E(x) =1∫− 1 xdx = × − 1 =2 2 2 431 1E(x ) =3∫ x dx = 0−1238= Cov(x,x2) = E(X3) − E(x)E(x2)−12= = 1/583 1 24+ 4×+ 9×= = 38 8 81= 04. 1 (13. 1 (14. 4 (15. 1 (16