Ayolah sekali lagi!! jawab dengan rumus yak!!! nomer 11-14

Mapel Matematika
Bab Statistika

11.
Xgab = (x1 . n1) + (x2 . n2) / (n1 + n2)
153 = (158 . Lk) + (150 . (32 - lk)) / 32
4896 = 158lk + 4800 - 150lk
96 = 8lk
lk = 12 anak

12.
Xgab = (x1 . n1) + (x2 . n2) / (n1 + n2)
60 = (66 . lk) + (58 . Pr) / (lk + pr)
60lk + 60pr = 66lk + 58pr
2pr = 6lk
2/6 = lk/pr
1/3 = lk/pr (A)

13.
Xgab = (x1 . n1) + (x2 . n2) / (n1 + n2)
78 = (75 . 2) + (80 . 3) + (65 . 1) + (90 . 1) + (x5 . 1) / 8
624 = 150 + 240 + 65 + 90 + x5
624 = 545 + x5
79 = x5 (C)

14.
Xgab = (x1 . n1) + (x2 . n2) / (n1 + n2)
Xgab = (5 . 2) + (6 . 4) + (7 . 2) + (8 .1) / 9
Xgab = 10 + 24 + 14 + 8 / 9
Xgab = 56/9

Median = X(n+1)/2 = X(10/2) = X5 = 6
Modus = 6

Mean + Median + Modus
= 56/9 + 6 + 6
= 56/9 + 12
= 56 + 108 /9
= 164/9
= 18 2/9

11)...
Pria = x
Wanita = y
153 = 158 x + 150 y / 32
32 - x = (Jumlah total siswa dikurangi jumlah total pria)
153 = 158 x + 150 ( 32 - x ) / 32
4896 = 158 x - 150 x + 4800
8x = 96
x = 96 / 8
x = 12 siswa ✔️

12)...
(66l + 58p) / l + p = 60
66l + 58p = 60l + 60p
66l - 60l = 60p - 58p
6l = 2p
3l = p
l = p / 3
l / p = 1 / 3 ✔️ (A.)

13)...
x = nilai fathir yang hilang...
Xgab = (x1 . n1) + (x2 . n2) / (n1 + n2)
78 = (75 × 2) + (80 × 3) + (65 × 1) + (90 × 1) + (x × 1) / 8
624 = 150 + 240 + 65 + 90 + x
624 = 545 + x
x = 79 ✔️ (C.)

14)...
Mean = (5 × 2 + 6 × 4 + 7 × 2 + 8 × 1) / (2+4+2+1)
Mean = (10 + 24 + 14 + 8) / 9
Mean = 56 / 9
Mean = 6 2/9

Median = data ke 1/2(10) = 5
Median data ke - 5 = 6

Modus = 6

Mean + Median + Modus
= 6 2/9 + 6 + 6
= 18 2/9 ✔️

Semoga bermanfaat......
-Prisco