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72+9=81
81:10=8,1
jadi nilai rata-rata fina 8,1
8 = ∑f / 9
∑f = 8 x 9 = 72
nilai rata-rata yang baru
x = ∑f / n
x = (∑f + 9) / 10
x = (72 + 9) / 10
x = 81/10 = 8,1
jadi nilai rata-rata ulangan kesepuluh nya adalah 8,1