### Overview

Statistics functions like mean, median, min, max, and stdev take a list as an argument and return a number.

Supported Functions:

total(x_1) *sum of all elements in a list*

length(x_1) *number of elements in a list*

mad(x_1) *mean absolute deviation*

stdev(x_1) *sample standard deviation*

stdevp(x_1) *population standard deviation*

var(x_1) *variance*

varp(x_1)* population variance*

cov(x_1, x_2) *covariance*

corr(x_1, x_2) *Pearson correlation coefficient of two lists*

nCr(n, r) *Number of combinations*

nPr(n, r) *Number of permutations*

n! *Factorial*

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