Jawaban:

dbwah ya

Penjelasan dengan langkah-langkah:

1. rata - rata =

(4+5+5+6+7+8+7+6+9+7+5+9+8+7) : 14 = 93 : 14 = 6,64

berarti yg nilai di bawah rata" = 6 orang

2. diurutkan dulu:

8,9,9,10,11,12,12,12

modus / nilai yg sering muncul = 12

median / nilai tengah = (data ke 4 + 5) : 2 = (10+11)/2 = 21/2 = 10,5

mean/rata" = (8+9+9+10+11+12+12+12) : 8 = 83:8 = 10,375

3.

18 putri = 72

12 putra (30-18) = 69

rata" kelas = ((18 x 72) + (12 x 69)) / 30

= (1296 + 828) / 30 = 2124 /30 = 70,8

4.

6 anak = 7

10 anak = 7,5

rata" 4 anak = ((7,5 x 10) - (6 x 7)) /4

= (75-42) / 4 = 33/4 = 8,25

5. diurutkan jadi:

30, 31, 32, 32, 33, 34, 34, 34, 35, 35, 35, 35, 36

modus = 35

median = data ke 7 = 34

mean = 436 / 13 = 33,54