Definition: The standard deviation measures how spread out a data set is from its mean. The standard deviation is the square root of the variance of a data set, and is calculated by this formula.
Examples:
- The data set 2,2,2,2,2 is not spread out at all, and has standard deviation of zero.
- The data set 2,3,4,4,5,6 has standard deviation of approximately 1.4.
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