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total nilai 10 anak = 8.2 × 10 = 82
selisih 1 anak = 10
nilai anak tersebut adalah 10
5. rata rata 19 anak = 145 cm
total tinggi = 19 ×145 = 2755 cm
2755 + 148 = 2903 cm
rata rata 20 anak = 2903 ÷ 20 = 145.15 cm
#maaf kalo salah yg nomor 6 saya kurang tau