Tercatat
pada Rabu, 22 Juli 2009
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Ukuran
Pemusatan Data
1.
Rataan
(Mean)
x̅
= 
atau x̅ = 
atau x̅ =
2.
Median
(Me)
Adalah
niali tengah suatu data yang telah diurutkan.
3.
Modus
(Mo)
Adalah
nilai yang paling sering muncul.
Contoh
:
Tentukan
rataan, median, modus, dari data di bawah ini !
1.
4,
5, 6, 6, 7, 7, 8, 9, 11
2.
4,
6, 8, 9, 10, 12, 14, 17
3.
14,
10, 11, 18, 20, 18, 21
4.
17,
13, 8, 9, 13, 20, 18
5.
2,
2, 5, 4, 6, 9, 6, 6, 13, 12
6.
6,
6, 7, 8, 8, 9, 9, 13, 14, 12, 12, 10
1.
4,
5, 6, 6, 7, 7, 8, 9, 11
Rataan : x̅ = 
= 
= 
= 7
= = = 7
Median : 7
Modus : 6 dan 7
2.
4,
6, 8, 9, 10, 12, 14, 17
Rataan : x̅ =
= 
= 10Median :
= 
= 9,5
Modus : -
3.
10,
11, 14, 18, 18, 20, 21
Rataan : x̅ =
= 
= 16
Median : 18
Modus : 18
4.
8,
9, 13, 13, 17, 18, 20
Rataan : x̅ = 
= 
= 80,85
= = 80,85
Median : 13
5.
2,
2, 4, 5, 6, 6, 6, 12, 13
Rataan : x̅ =
= 
= 6,5Median :
= 
= 6Modus : 6
6.
6,
6, 7, 8, 8, 9, 9, 10, 12, 12, 13, 14
Rataan : x̅ =
= 
= 9,5Median :
= 
= 9
Modus : 6, 8, 9, 12
