Write a function listAverager that takes a list of numbers as a parameter

# and returns the average of the list as a float. For example, if the list is

# list$\_$of$\_$num $=[1\mathrm{.}2,4\mathrm{.}5,3\mathrm{.}2,10]$

# then print$($listAverager$($list$\_$of$\_$num$))$ returns $4\mathrm{.}725.$ Remember to protect

# against a list length of $0.$ Test it$!$