Tolong ya kak jwb dgn benar

£n = total seluruh bilangan
n = 10

£n = 7 +8 + (x + 3) + 7 + 9 + 8 + 6 + 7 + 6 + 8
= 66 + x + 3
= x + 69

rata-rata = £n : n
7,4 = (x + 69) : 10
7,4 (10) = x + 69
74 = x + 69
74 - 69 = x
x = 5