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np = 18 - nw
nw = 18 - np
X = Xp . np + Xw . nw / ns
80,5 = 77 . np + 86 . nw / 18
77np + 86nw = 18 . 80,5
77(18 - nw) + 86nw = 1449
1386 - 77nw + 86nw = 1449
9nw = 1449 - 1386
9nw = 63
nw = 63/9
nw = 7
Maka banyaknya siswa wanita atau putri dalam kelas tersebut adalah 7 orang