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Verified answer
Jawabn1 = banyak putri
x1= rata rata kelompok putri = 7,5
n2 = banyak putra
x2 = rata rata kelompok putra = 6,7
xs = rata rata kelas
(n1 + n2) xs = n1 x1 + n2 x2
(n1 + n2) 6,9 = n1 (7,5) +n2(6,7)
n2(6,9- 6,7) = n1 (7,5 - 6,9)
0,2 n2 = 0,6 n1
2 n2 = 6 n1
n2 = 3n1
Perbandingan banyak putra dan putri n2 : n1 = 3 : 1