In this task you will be given a list of numbers and you need to find the mean (average) of that list. The mean of a list can be found by summing every number in the list then dividing the result by the size of that list. The output should be rounded to 3 decimal places.

Ex Input:
[218.807, 72.849, 7.838, 124.81, 45.929, 239.888]

Ex Output:
118.354


Ex Input:
[-79.597, 26.839, 178.556, -5.626, -37.294, 232.757, 136.684]

Ex Output:
64.617


Ex Input:
[154.805, -99.136, 113.495, -58.447]

Ex Output:

27.679


