tolong bantuin yaa sebisa kalian #makasih:)

26. Sr =
[tex] \frac{110 + 120 + 130 + 140 + 150 + 160}{6} = 135[/tex]
110 - 135 = -25 |25|
120 - 135 = -15 |15|
130 - 135 = -5 |5|
140 - 135 = -5 |5|
150 - 135 = 15 |15|
160 - 135 = 25 |25|
Jumlah = 90
Sr =
[tex] \frac{90}{6} = 15[/tex]

26.
Rata-rata = 110+130+150+120+140+160 : 6. =760:6
= 120

27.
3+4+4+5+5+6+6+7+7+8+8+9 
= 72/12=6 

Ragam
σ² = (3-6)²+(4-6)²+(4-6)²+(5-6)²+(5-6)²+(6-6)²+(6-6)²+(7-6)²+(7-6)²+(8-6)²+(8-6)²+(9-6)²
    =  9 + 4 + 4 + 1 + 1 + 1 + 1 + 4 + 4 + 9
    = 38/12
    = 19/6 

28.
urutkan dulu
5,6,6,6,6,7,7,7,7,7,7,8,8,8,8,9
rata-rata = (5 + (6×4) + (7×6) + (8×4) +9)/16
= 112/16
= 7
[tex] {s}^{2} = {(5 - 7)}^{2} + 4{(6 - 7)}^{2} \\ + 6 ({7 - 7})^{2} +4 ({8 - 7})^{2} + ({9 - 7})^{2} \\ = \frac{16}{16} = 1[/tex]
jawabannya C

29.
Bilangan kita umpamakan menjadi A, B dan C
A≠0 Maka A={1,2,3,4,5,6,7,8,9}  ..... ( n(A) = 9 )
B={0,1,2,3,4,5,6,7,8,9}    ............ ( n(B) = 10 )
C={1,3,5,7,9}         ........ ( n(C) = 5 )

Maka jumlah nomor pegawai yang ganjil ada sebanyak :
n(A) x n(B) x n(C) = 9x10x5 = 450