Question

Which is true about standard deviation?

Answer 1

It tells how much observations from a set of data are dispersed from its mean. It is calculated by taking the square root of variance that is nothing but the average of squared deviations from mean. Thus, standard deviation is a standard measure of dispersion of data or risk.

Answer 2

The standard deviation is a statistic that measures the dispersion of a dataset relative to its mean and it is calculated as the square root of variance