JAWABAN :
1.
Banyaknya kelas ( K )
Diketahui n = 40
K = 1 + (3.322 x log n)
= 1 + (3.322 x log 40)
= 1 + (3.322 x 1.6)
= 1 + 5.315
= 6.315 (dibulatkan ke atas)
K = 7
2.
Nilai tertinggi 97 + 0.5 = 97.5
Nilai terendah 63 – 0.5 = 62.5
SELISIH 97.5 – 62.5 = 35
Interval = 35 : 7
= 5
3.
|
KELAS
|
INTERVAL
|
FREKUENSI
|
PERSENTASE
|
|
1
|
62.5≤x≥67.5
|
4
|
10%
|
|
2
|
67.5≤x≥72.5
|
6
|
15%
|
|
3
|
72.5≤x≥77.5
|
4
|
10%
|
|
4
|
77.5≤x≥82.5
|
4
|
10%
|
|
5
|
82.5≤x≥87.5
|
8
|
20%
|
|
6
|
87.5≤x≥92.5
|
12
|
30%
|
|
7
|
92.5≤x≥97.5
|
2
|
5%
|
|
TOTAL
|
|
40
|
100%
|
