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75 × 9 = 675
80 × 12 = 960
85 × 7 = 595
90 × 7 = 630
95 × 6 = 570
630 + 675 + 960 + 595 + 630 + 570 = 4060
(frekuensi di tambah semua) 9+9+12+7+7+6 = 50
4060 : 50 = 81,2