Page 65 - COVER STATISTIKA JUNIOR

Jawab:

Setelah diurutkan : 4, 4, 5, 5, 6, 6, 6, 7, 7, 7, 8, 8 dan n = 12

( 1 n + ) 1 12 + 1 13 1
Letak Q1 = = = = 3
4 4 4 4

1
Jadi Q1 = 5 + (5 – 5) = 5
4

( 2 n + ) 1 ( 2 12 + ) 1 26 1
Letak Q2 = = = = 6
4 4 4 2

1
Jadi Q2 = 6 + (6 – 6) = 6
2

( 3 n + ) 1 ( 3 12 + ) 1 39 3
Letak Q3 = = = = 9
4 4 4 4

3
Jadi Q3 = 7 + (7-7) = 7
4

2. Kuartil Data Kelompok

 n − F 
1
Qi = b + P  2 
 f 

Dimana:

Qi = Kuartil ke-i

b = tepi bawah kelas Qi

P = panjang kelas

n = banyak data
F = jumlah frekuensi sebelum kelas Qi

f = frekuensi kelas Qi

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