[tex]Rata - rata \: nilai \\ \frac{jumlah \: nilai}{banyak \: siswa} \\ \\ \frac{60 + 3(70) + 75 + 3(80) + 8(90) + 4(100)}{1 + 3 + 1 + 3 + 8 + 4} \\ \\ \frac{60 + 210 + 75 + 240 + 720 + 400}{20} \\ \\ \frac{1.705}{20} = 85,25 \: (D)[/tex]
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[tex]Rata - rata \: nilai \\ \frac{jumlah \: nilai}{banyak \: siswa} \\ \\ \frac{60 + 3(70) + 75 + 3(80) + 8(90) + 4(100)}{1 + 3 + 1 + 3 + 8 + 4} \\ \\ \frac{60 + 210 + 75 + 240 + 720 + 400}{20} \\ \\ \frac{1.705}{20} = 85,25 \: (D)[/tex]