tolong no 36 caranya y

gk ngerti,up to you lah hehehehe....

jawab

n1 = banyak  waita
x1 = rata rata wanita = 158
n2 = banyak pria = 168
x2 = rata rata pria

n1+n2 = 30
rata rata gabungan = xG = 165

(n1+n2) xG  = n1 x1 + n2 x2
(n1 + n2) 165 = n1 (158) + n2 (168)

n1(165- 158) = n2(168 - 165)
n1(7) = n2(3)
n1 : n2 = 3 : 7
jumlah perbandingan = 10
n1 + n2 = 30
banyak siswa wanita =n1 = 3/10 x 30 orng = 9 orang