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Verified answer
30 siswarata2 = 5,8
jumlah nilai = 5,8*30 =174
30+8 =38
rata2 = 6,0
jumlah nilai = 6,0 *38 = 228
jumlah nilai 8 siswa =228-174 = 54
rata2 8 siswa = 54 /8 = 6,75
semoga bantu yaaa