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x=105/20
x=5,25
x=nilai rata-rata
maka banyak siswa yg mendapat nilai lebih dari rata-rata adalah
3+1+3+1
=8
4x7=28
5×2=10
6×3=18
7×1=1
8×3=24
9×1=9
=91÷7=13 gak ada jwaban nya