TUGAS
STATISTIK 3
Data
hasil kemampuan menulis surat dinas siswa kelas VIII SMP Negeri 2 Tambang Kabupaten Kampar.
45, 60, 35, 40, 30, 60,
35, 45, 30, 55, 30, 30, 35,
35, 35, 35, 35, 35, 40, 40,
35, 35, 35, 40, 45, 50,
45, 40, 50, 35, 40, 40,40, 45,
45, 45, 45, 45, 45, 45,
45, 45, 40, 40, 45, 50. 50, 50, 50,
55, 60, 60,
A.
Rata-rata
hitung
X = X1 + X2 + X3 + …….Xn
n
X =
∑ xi
i=1
n
X =
45+60+35+30+60+35+45+30+55+35+35+35+40+45+50+45+40+50+35+45+45+40+40+45+50
26
X = 1110
26
X = 42,7
Dari nilai rata-rata diatas dapat di buat table
distribusi frekuensi.
1.
Tentukan
rentangan data
R = 60 – 30 R = rentangan
= 30 K
= Kelas internal
2.
Banyak
kelas interval
K = 1+ ( 3,3
x log n )
= 1 + ( 3,3 x log 26)
= 1 + ( 3,3 x 1,4149)
= 5, 66917
= 6
3.
Panjang kelas
P =
R = 30 = 5
K
6
4. Ujung bawah → 30
Data hasil kemampuan menulis surat
dinas
|
Data hasil kemampuan menulis
|
Banyak ( Fi )
|
Xi
|
Fi . Xi
|
|
30 – 34
|
2
|
32
|
64
|
|
35 – 39
|
6
|
37
|
222
|
|
40 – 44
|
5
|
42
|
210
|
|
45 – 49
|
7
|
47
|
329
|
|
50 – 54
|
3
|
52
|
156
|
|
55 – 59
|
1
|
57
|
57
|
|
60 – 64
|
2
|
62
|
124
|
|
Jumlah
|
26
|
|
1162
|
5.
Rata-rata
X = ∑Fi. Xi
i = 1` = 1162
= 44,69
k 26
∑fi
I=I
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