tolong dibantu no 1,2&3 pakek caranya

1.
besar sudut IUD = 360-(92+58+96)
360-246 = 114°
banyak orang =
[tex] \frac{114 \times 900}{360} = 285[/tex]

jadi banyak orang yg mengikuti IUD = 285 orang

2.
14 orang rata-rata = 7000
14+1 orang kuli baru, rata rata = 6.800

6.800 × 15 = 102.000
7000 × 14 = 98.000

15 = 102.000
14 = 98.000
___________-
1 = 4000

jadi besar pendapat kuli baru = 4000

3.
rata rata nilai 3a
4×4 = 16
5×2 = 10
6×6 = 36
7×5 = 35
8×3 = 24
________+
121
n(frekuensi) = 4+2+6+5+3 = 20
rata rata = 121/20 = 6,05

rata rata nilai 3b
4×3 = 12
5×7 = 35
6×4 = 24
7×4 = 28
8×2 = 16
________+
115
n(data) = 3+7+4+4+2 = 20
rata rata = 115/20 = 5,75

selisih = 6,05-5,75 = 0,30
jadi selisih = 0,30

semoga membantu