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rata2 = 7,2
nilai total = 72 x 36 = 259,2
38 siswa (krn + 2 anak tambahan yg susulan)
rata2 = 7,1
nilai total = 7,1 x 38 = 269,8
jumlah nilai 2 anak tambahan
269,8 - 259,2 = 10,6
rata2 2 anak itu
10,6 : 2 = 5,3(a)