jawab pakai cara yaaaaaa terima kasiihhhhhhhhh

Mean=( 5×3)+(6×8)+(7×n)+(8×2)+. (9×1) dibagi (3+8+n+2+1)
6,5 = 88+7n dibagi 114+n
6,5×(14+n) = 88+7n
91+6,5n = 88+7n
6,5n-7n =88-91
-0,5n = -3
n =6


Semoga bermamfaat......