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11+9
mean = 135 + 110
20
mean = 245
20
mean = 12,25
jadi rata-rata keseluruhan 12,25
11 × 10= 11
135 + 110= 245
9 + 11= 20
Rata-rata seluruh bilangan :
245/20
12,25
Jadi, rata-rata keseluruhan bilangan tersebut adalah 12,25.