The built-in math module contains a few aggregate
functions useful for calculating statistics. One example, mean, is for calculating the arithmetic mean of a set.
Since this function belongs to the math module, the
module name needs to be specified when calling it:
Two others, stddev and stddev_pop, are for calculating the
sample and population standard deviation, respectively.
Similarly, var and var_pop allow for calculating
sample and population variance. Try them out:
