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For your example, in your data the average is -3.318.

412 * (2 - 3.318)^2 = 715.7
307 * (4 - 3.318)^2 = 142.8
211 * (6 - 3.318)^2 = 1517.7
70 * (0 - 3.318)^2 = 770.6

(715.7 + 142.8 + 1517.7 + 770.6) / 999 = 3.15

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ok, thanks. Not quite as short a short cut as I was hoping for, but it's not too hard to make a couple extra tables in excel to do it this way.