" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
7,8 = [3 x a] + [12 x 7,5]
----------------------------
15
7,8 x 15 = 3a + [12 x 7.5]
selanjutnya bisa kan ? kalo ga bisa nanti aku bantu lagi ...
x2 = ? ; f2 = 3
Mean = 7,8
Mean = x1.f1 + x2.f2 ÷ (f1+f2)
7,8 = 7,5 . 12 + 3? ÷ 15
7,8 . 15 = 90 + 3?
117 = 90 + 3?
117 - 90 = 3?
27 = 3?
9 = ?
jadi, rata-rata nilai 3 siswa tersebut adalah 9