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Sum = 42 Count = 6 Mean = Sum/Count = 42/6 = 7
9 + 7 = 16 9 - 7 = 2
20
10, 9, 8, 7, 6 or 11, 9, 8, 7, 5 etc
the sum of -2 and 6 and 7 is (-2+6+7)