Ukuran
Pemusatan :
1. Mean ( rataan hitung )
a. Mean data tunggal
X = ∑ Xi
n
Dengan ∑Xi = jumlah perkalian
antara bilangan pokok dengan frekuensinya
N =
banyaknya data
b. Mean data berkelompok
X = ∑ fi . xi
∑ fi
Dengan Xi = titik tengah kelas
2. Rataan sementara
a. Data tunggal
X = Xs + ∑
fi . di
Dengan Xs =
rataan sementara yang digunakan
Di = Xi – Xs
b. Data berkelompok
X = Xs + ∑ fi . di
∑ fi
Dengan Xi = titik tengah
3. Median
a. Apabila n = ganjil
Me = x ½ (n+1)
b. Apabila n = genap
Me = x
n/2 + x n/2 +1
2
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