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8.29
If you mean: 8 9 10 11 and 12 then the average mean is 10
'Mean' is the average of a range. (6+9+7+3+10+9)÷6=7.333333333 (7.33 to two decimal points).
Mean = (9 + 10 + 2 + 5 + 5)/5 = 31/5 = 6.2
Mean: 13.6 Median: 15 Mode: 16, 18, 15, 9, 10