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6,2 = (6n+7):(n+1)
6,2.(n+1) = 6n+7
6,2.n+6,2 = 6n+7
6,2n-6n = 7-6,2
0,2n = 0,8
n = 0,8/0,2
n = 4 orang
6,2 ∑fi =6∑fi +42
6,2 ∑fi - 6∑fi =42
0,2 ∑fi = 42
∑fi = 210
Jadi banyak siswa semula
6n = 210
n = 35 siswa