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8+2=10 6-2=4
To find the mean (or average) you first add up the numbers you have. NOTHING 1.88
You could break down the corresponding elements. So you could add the 600 and the 200 giving 800. You could then add the 90 and the 2, giving 92. Then add the 800 and the 92, giving 892.
Sum = 79*(79+1)/2 = 79*80/2 = 3160
98