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rata2 = 7,5
nilai total = 7,5 x 16 = 120
16 anak + 4 anak = 20 anak
rata2 = 7,44
nilai total = 20 x 7,44 = 148,8
nilai 4 anak itu maka
148,8 - 120
28,8
rata2 4 anak = 28,8 : 4 = 7,2
148,8 - 120 = 28,8
jd rata2 4 siswa baru adl 28,8/4= 7,2