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Diurutkan dari yang kecil ke besar
40, 50, 55, 60, 65, 65, 75, 80
Jumlah nilai
X = ---------------------
Banyaknya nilai
40 + 50 + 55 + 60 + 65 + 65 + 75 + 80
X = -------------------------------------------------
8
490
X = -----
8
X = 61, 25