7
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If you mean: -11 times (-3 -9) then it is +132
The arithmetic mean of 10, 11, and 6 is 9. Add them together then divide by 3.
To find the mean you add them all up then divide by the number of numbers so: 1+3+5+7+9+11 divided by 6 = 36/6 = 6
If you mean: 12, 11, 9, 6, 2 then the next number is -3 Because they are being reduced by 1, 2, 3, 4 and then 5
9.75