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The mean of any group of 11 numbers is (their sum) divided by 11.
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(4 + 4 + 6 + 7 + 11 + 11) / 6 = 43/6 = 7.166 (rounded, repeating)
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
The LCD of 11/6 and 2/4 is 12.