Sum from i = 1 to i = N of n(i) /N, where N equals number of numbers, and n(i) equals number, is a statistic {mean, population}| {average}. For example, the numbers 1, 2, 2, 3, 4, 5, and 6 have mean equal to (1 + 2 + 2 + 3 + 4 + 5 + 6) / 7. Average is number-group balance point, because sum of differences between numbers and mean equals zero.
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Date Modified: 2022.0224