2 + 5 + 11 = 18
The mean is the same as the average, which is the sum of the numbers divided by the total number of numbers that were added, in this case three. So the mean is 18/3 = 6.
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The GCF is 1.
Multiply by 5 and add 20 (or equivalently, add 4 and then multiply by 5)
Mean = (9 + 10 + 2 + 5 + 5)/5 = 31/5 = 6.2
If you mean: (2, -5) and (-2, 5) then the slope works out as -5/2 or as -2.5
what is the mean of -10, -5, 2, 6, 17