Data
|
f
|
60-62
|
5
|
63-65
|
18
|
66-68
|
42
|
69-71
|
27
|
72-74
|
8
|
rumus
mean = ∑ (f . xi)/∑fi
cari
xi ? dan fi . xi ? terlebih dahulu.
Data
|
fi
|
xi
|
fi.xi
|
60-62
|
5
|
61
|
305
|
63-65
|
18
|
64
|
1152
|
66-68
|
42
|
67
|
2814
|
69-71
|
27
|
70
|
1890
|
72-74
|
8
|
73
|
584
|
jumlah
|
100
|
6745
|
Mean = ∑ (f . xi)
———
∑fi
=
6745/100
=
67,45
contoh soal mean 2
Data
|
f
|
21-25
|
2
|
26-30
|
8
|
31-35
|
9
|
36-40
|
6
|
41-45
|
3
|
46-50
|
2
|
rumus
mean = ∑ (f . xi)
———
∑fi
Data
|
f
|
xi
|
fi
. xi
|
21-25
|
2
|
23
|
46
|
26-30
|
8
|
28
|
224
|
31-35
|
9
|
33
|
297
|
36-40
|
6
|
38
|
228
|
41-45
|
3
|
43
|
129
|
46-50
|
2
|
48
|
96
|
Jumlah
|
30
|
1020
|
Mean
= ∑ (f . xi)
———
∑fi
=
1020/30
=
34
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