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5 . 4 = 20
6 . x = 6x
7 . 6 = 42
8 . 3 = 24
9 . 2 = 18
___ +
jlh nilai = 6x + 112
jlh data 17 + x
rata rata = 6,5
(6x + 112)/(17 + x) = 6,5
6x + 112 = 110,5 + 6,5x
1,5 = 0,5x
x = 3
maka banyak siswa yang mendapat nilai 6 adalah 3 orang