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Line 200:
:<math>
\sigma\ = \sqrt{\frac{1}{N}\left(\sum_{i=1}^N{{x_i}^2} - \frac{\left(\sum_{i=1}^N{x_i}\right)^2}{N}\right)} = \sqrt{\frac{1}{N}\left(\sum_{i=1}^N{{x_i}^2}\right) - \overline{x}^2
</math>
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Line 200:
:<math>
\sigma\ = \sqrt{\frac{1}{N}\left(\sum_{i=1}^N{{x_i}^2} - \frac{\left(\sum_{i=1}^N{x_i}\right)^2}{N}\right)} = \sqrt{\frac{1}{N}\left(\sum_{i=1}^N{{x_i}^2}\right) - \overline{x}^2
</math>
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