Standard deviation is a widely used measurement of
variability or diversity used in statistics and
probability theory. It shows how precise your data is.

The standard deviation is the square root of its
variance. A low standard deviation indicates that the
data points tend to be very close to the mean, whereas
high standard deviation indicates that the data are
spread out over a large range of values. Variance and
standard deviation depend on the mean of a set of
numbers. Calculating them depends on whether the set
is a population or sample.

Download (1524 KB) Website Link to this page