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Regarding, variance and standard deviation discussed on page 333, I am confused. First, the formulas for both use the sigma-squared sign: 2 = [insert formula].

Regarding, variance and standard deviation discussed on page 333, I am confused. First, the formulas for both use the sigma-squared sign: 2 = [insert formula]. Second, if variance equals the average squared deviation - how do we find the deviation to average it, then square it

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