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4 = 4 x 3 = 12
5 = 5 x 8 = 40
6 = 6 x 10 = 60
7 = 7 x 11 = 77
8 = 8 x 6 = 48
9 = 9 x 2 = 18
Jumlah nilai = 12 + 40 + 60 + 77 + 48 + 18 = 255
Jumlah siswa = 3 + 8 + 10 + 11 + 6 + 2 = 40
Rata-rata = jumlah nilai : jumlah siswa = 255 : 40 = 6,375
Banyak siswa yang mendapat nilai di atas rata-rata (7, 8, dan 9)
11 + 6 + 2 = 19 orang (D)