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How do you calculate standard deviation?

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s^2 = \frac{\sum_{i=1}^n \left(x_i - \overline{x_i} \right)^ 2}{n-1}

Where:

  • s in the sample variance.
  • n is the number in your sample.
  • x is each value in the sample.
  • \overline{x} is the sample mean.

If you don't understand that.

  • You subtract the average from a number in your sample and square it.
  • Do the same for each number in your sample and add up all the answers you get.
  • Divide by 1 less than the number of numbers in your sample.

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