In statistics, the standard deviation is a measure of the amount of variation or dispersion of a set of values. A low standard deviation indicates that the values tend to be close to the mean (also called the expected value) of the set, while a high standard deviation indicates that the values are spread out over a wider range.
\(\operatorname{stddev}(x) = \sqrt{\frac{1}{n} \sum_{i = 1}^n (x_i - \bar{x})^2}\)
Bibliography
“Standard Deviation.” 2022. Wikipedia, November. https://en.wikipedia.org/w/index.php?title=Standard_deviation&oldid=1120954441.