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= Jumlah Data : Banyak Data
= ((50 x 4) + (58 x 1) + (70 x 1) + (80 x 3) (90 x 2)) : (4 + 1 + 1 + 3 + 2)
= (200 + 58 + 70 + 240 + 180) : 11
= 748 : 11
= 68
Jadi, rata-rata data tersebut adalah 68