rata-rata = jumlah nilai : jumlah data
rata-rata =8+6+7+8+9+10+7+9+10+9+10+9 : 12
rata-rata = 102 : 12
rata-rata = 8,5
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rata-rata = jumlah nilai : jumlah data
rata-rata =8+6+7+8+9+10+7+9+10+9+10+9 : 12
rata-rata = 102 : 12
rata-rata = 8,5