LATIHAN PERTEMUAN 2 STATISTIKA DESKRIPTIF CREAT BY SEFTA

LATIHAN PERTEMUAN 2 STATISTIKA DESKRIPTIF � CREAT BY: SEFTA LAYLI U. F � NIM: 11140711 � KELAS: 11. 2 A. 04

NOTASI SIGMA DIKET : X 1=3 X 2=4 X 3=6 Y 1=4 Y 2=1 Y 3=5 i=1 s/d n EXAMPLE: 1 X 1+X 2+X 3 = 3 + 4 + 6 =13

2 =4 3 =4{X 2 +X 3} =4{4+6} =4{10} =40 =nk=3 x 8=24 Atau=8+8+8=24

4 5 =(X 1+3)+(X 2+3) =(3+3)+((4+3) =6 +7 =13 (X 1 -2)2 =(X 1 -2)2 +(X 2 -2)2 +(X 3 -2)2 =(3 -2)2 +(4 -2)2 +(6 -2)2 =12 +22+42 =1+4+16 =21

6 (X 12 -2) = (X 12 -2)+( X 22 -2)+(X 32 -2) =(32 -2)+(42 -2)+(62 -2) =(9 -2)+(16 -2)+(36 -2) =7+14+34 =5 5 7 X 12 -2 =(X 1+X 2+X 3 ) 2 =(3+4+6) 2 -2 =(13) 2 -2 =169 -2 =167 -2

8 =nk=3 x 7=21 Atau=7+7+7=21 9 = =5{X 1+X 2+X 3} =5{3+4+6} =5{13} =65

10 (X 1+2 Xi) ={(X 1+2(X 1) }+{(X 2+2 X 2)} ={3+2(3)}+{4+2(4)} ={3+(6)}+{4+(8)} =9+12 =21

EXAMPLE 1 Y 1+Y 2+Y 3 =4+1+5 =10 2 =4 =4{Y 2 +Y 3} =4{1+5} =4{6} =24

3 4 =nk=3 x 8=24 Atau=8+8+8=24 (Y 1+3) =(Y 1+3)+(Y 2+3) =(4+3)+((1+3) =7 + 4 =11

5 (Y 1 -2)2 =(Y 1 -2)2 +(Y 2 -2)2 +(Y 3 -2)2 =(4 -2)2 +(1 -2)2 +(5 -2)2 =22 +(-1)2+32 =4+1+9 =14

6 (Y 12 -2) = (Y 12 -2)+( Y 22 -2)+(Y 32 -2) =(42 -2)+(12 -2)+(52 -2) =(16 -2)+(1 -2)+(25 -2) =14 -1+23 =36 7 Y 12 -2 =(Y 1+Y 2+Y 3 ) 2 =(4+1+5) 2 -2 =(10) 2 -2 =100 -2 =98 -2

8 9 =nk=3 x 7=21 Atau=7+7+7=21 =5{Y 1+Y 2+Y 3} =5{4+1+5} =5{10} =50

10 (Y 1+2 Yi) ={(Y 1+2(Y 1) }+{(Y 2+2(Y 2)} ={4+2(4)}+{1+2(1)} ={4+(8)}+{1+(2)} =12+3 =15

THE END