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Semoga membantu,maaf jika ada kesalahanMatematika SMP Kelas VII
50, 70, 45, 55, 90, 95, 35, 80, 87, 60, 65, 70, 75
diurutkan
35, 45, 50, 55, 60, 65, 70, 70, 75, 80, 87, 90, 95 → ada 13
rata-rata = (35 + 45 + 50 + 55 + 60 + 65 + 70 + 70 + 80 + 87 + 90 + 95)/13
rata-rata = 877/13
rata-rata = 67,46
di atas 67,46 adalah 70, 70, 75, 80, 87, 90, 95 → ada 7
di bawah 67,46 adalah 35, 45, 50, 55, 60, 65 → ada 6
jawabannya B