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The standard deviation is a statistic that measures the
dispersion of a dataset relative to its mean and is calculated
as the square root of the variance.
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standard deviation helps you understand
how much individual data points deviate from the average,
providing a measure of the dataset's variability or dispersion.
A low standard deviation implies less variability,
while a high standard deviation implies greater variability.
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If you average the absolute value of sample deviations from the mean, you get the mean or average deviation. If you instead square the deviations, the average of the squares is the variance, and the square root of the variance is the standard deviation.