Bantu no 3 pake jalannya

Jumlah nilai = (5.3) + (6.x) + (7.4) + (8.4) + (9.2)
= 15 + 6x + 28 + 32 + 18
= 6x + 93

jumlah data = 3 + x + 4 + 4 + 2 = x + 13

rata2 = jumlah nilai / jumlah data
7 = (6x + 93) / (x + 13)
7(x + 13) = 6x + 93
7x + 91 = 6x + 93
7x - 6x = 93 - 91
x = 2

Jawaban A