Standard deviation | Mean, Variance & Distribution | Britannica
https://www.britannica.com/topic/standard-deviation-statistics
WEBMar 3, 2024 · It is specifically defined as the positive square root of the variance (σ 2 ); in symbols, σ 2 = Σ ( xi − μ) 2 / n, where Σ is a compact notation used to indicate that as the index ( i) changes from 1 to n (the number of elements in the data set), the square of the difference between each element xi and the mean, divided by n, is calculated and ...
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