Question

Nilai 10 20 30 40 50 60 70
f(x) 3 2 2 4 x 4 2
jika rata-rata 41 berapa nila x ! bantu ya !! orang yang pertama kali jawab aku kasih jawaban terbaik ( kalo jawabannya lengkap.. sama caranya ya )
itu 10 lurus 3, 20 lurus 2, 30 lurus 2, 40 lurus 4, 50 lurus x, 60 lurus 4 dan 70 lurus 2

Answer 1

= 10, = 3
= 20, = 2
= 30, = 2
= 40, = 4
= 50, = x
= 60, = 4
= 70, = 2
rata-rata = 41

rata-rata =
41 =
41 =
41 x (17 + x) = 670 + 50x
697 + 41x = 670 + 50x
50x - 41x = 697 - 670
9x = 27
x = 27 : 9
x = 3