10
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11/12 is greater than 8/9 8/9 = 11/12 by cross multiplication: 8 * 12 = 9 * 11 96 < 99 thus, 11/12 is greater than 8/9
If you mean: 8 9 10 11 and 12 then the average mean is 10
12+8+10+12+11+9 = 62
Average = (12 + 8 + 7)/3 = 27/3 = 9
The average of these three numbers is 10.666