... 25 ,041===∑nRRBBb) 24 ,86%683 20 43 )27 ( )24 ( )21 0( )25 (1)( 22 22 2=→==−+−−+−+−−=−−=∑AAiAAnRRR3 )25 ,09) (25 ,08( )25 , 02( )25 ,04(1)( 22 2 2−−−+−−+−==−=∑nRRBiBBδ= 3,75 2 + 2, 25 2 + 7,75 2 + 9 ,25 2 = 54, 92 4,7 2 ==BBδδc) 3))((),(BiBAiARRRRBACov −−=∑= (-5 -2) (4-0 ,25 )+(10 -2) x( -2- 0 ,25 )+(-4 -2) (8-0 ,25 )+(7 -2) 1,4531373 )25 ,9(575,7 625 ,28 75,37==−+−−−vxxxP(A,B)=BRRCovABA6),(δ=748,0 25 ,84,767,45−=−x77Ta ... đượca) 2 484%7%)4(%10%5==+++==∑nRRAA 25 ,041===∑nRRBBb) 24 ,86%683 20 43 )27 ( )24 ( )21 0( )25 (1)( 22 22 2=→==−+−−+−+−−=−−=∑AAiAAnRRR3 )25 ,09) (25 ,08( )25 , 02( )25 ,04(1)( 22 2 2−−−+−−+−==−=∑nRRBiBBδ= ... đây.yliiliipWWW∑∑==+=4 2 21 2 .δδX *******660 ,2 )(%)8( )2, 0( 2 222 1λδCov×=0,3=×= )3,() 12. ()3,0( 22 2 2 rriCovδ**********0,4110)0,(),(%)15()4,0(1441 22 23−==×= rrCovrrCovδ0,1140)0;();(%)10()1,0( 24 42 22 4−==×=...