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(2.9 + 2.2 + 5 + 4.7 + 5.1) / 5 = 19.9 / 5 = 3.98
rata-rata hilir :
(1.8 + 4.7 + 6.8 + 1.8 + 7.2) / 5 = 22.3 / 5 = 4.46
Selisih = 4.46 - 3.98 = 0.48