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Anonymous
The mean is 8 because: (1+6+10+11+12)/5=8
We know that the Arithmetic Mean of a data set = (sum of all the items)/ number of items.
=(1+6+10+11+12)/5
=(40)/5
=8.
The Arithmetic Mean of 1, 6, 10, 11, and 12 is 8.
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12
11
-11
If you mean -3a = 10-11 then a = 1/3