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:
[212.456, 6.972, -59.399, -83.342, 215.038, -97.851]

Ex Output:
32.312


Ex Input:
[-66.271, 56.586, -21.072, 136.915, 54.951, 112.054]

Ex Output:
45.527


Ex Input:
[48.85, 54.649, 209.159]

Ex Output:

104.219


