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jumlah nilainya = 5.8 * 30 = 174
-rata-rata 38 siswa = 6
jumlah nilainya = 6 * 38 = 228
-jumlah nilai 8 siswa = 228 - 174 = 54
-rata-rata 8 siswa = 54 / 8 = 6.75
30×5,8 = 174
38 × 6,0 = 228
174-48 =54
54/8 =6.75