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berat rata2 = 780 + 1200 / 40
berat rata2 = 1980/ 40
berat rata2 = 49,5 kg
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15 + 25 orang
780 + 1200
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40 orang
1980 ÷ 40 = 49.5
jadi, berat rata rata seluruh siswa 49.5