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x = jumlah tinggi badan 15 anak = x
152 = x / 15
x = 15 × 152
x = 2280
jika indra masuk kelompok 15 , maka 15 + 1 = 16 anak, ratarata menjadi 152, 5 cm
152, 5 = x / 15 +1
x = 16 × 152, 5
x = 2440
2440 - 2280 = 160
tinggi badan indra adalah 160 cm