Nilai rata-rata
[tex] \frac{jumlah \: nilai}{banyak \: siswa} \\ \\ \frac{(6 \times 8) + (7 \times 10) + (8 \times 6) + (9 \times 4) + (10 \times 2)}{(8 + 10 + 6 + 4 + 2)} \\ \\ \frac{(48 + 70 + 48 + 36 + 20)}{30} \\ \\ \frac{222}{30} = 7,4 \\ \\ \\jumlah \: siswa \: di \: atas \: rata - rata \\ 6 + 4 + 2 = 12 \: siswa \: (C)[/tex]
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Nilai rata-rata
[tex] \frac{jumlah \: nilai}{banyak \: siswa} \\ \\ \frac{(6 \times 8) + (7 \times 10) + (8 \times 6) + (9 \times 4) + (10 \times 2)}{(8 + 10 + 6 + 4 + 2)} \\ \\ \frac{(48 + 70 + 48 + 36 + 20)}{30} \\ \\ \frac{222}{30} = 7,4 \\ \\ \\jumlah \: siswa \: di \: atas \: rata - rata \\ 6 + 4 + 2 = 12 \: siswa \: (C)[/tex]