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Rata-rata = Jumlah Seluruh Data/Banyaknya data
Sehingga....
Rata-rata = (5+8+9+9+5+8+4+a+5+6+6+3)/12
6,3 = (68+a)/12
75,6 = 68 + a
7,6 = a
6,3= 3+4+5+5+5+6+6+8+8+9+9+a / 12
6,3 = 68+a/12
6,3 * 12 = 68 + a
75,6 = 68 + a
a= 7,6