dibantu yaa makasehh

Kelas 6 Matematika
Bab Pengolahan Data

 . = kali

Nilai rata-rata = 7,2
(5 . 2 + 6 . 4 + 7 . x + 8 . 6 + 9. 3)/(2 + 4 + x + 6 + 3) = 7,2
10 + 24 + 7x + 48 + 27 = 7,2 . (15 + x)
109 + 7x = 108 + 7,2x
109 - 108 = 7,2x - 7x
1 = 0,2 x
x = 1/0,2
x = 5