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10
If you mean: 8 9 10 11 and 12 then the average mean is 10
50
6 + 9 + 12 + 5 + 18 = 50 There are five numbers being averaged, so…. 50 divided by 5 equals an average of 10
5+7+9+12+12 = 45 and 45/5 = 9 which is the mean average