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:
[166.542, 216.326, 98.969, -96.779, 33.532]

Ex Output:
83.718


Ex Input:
[135.807, 205.755, 191.805]

Ex Output:
177.789


Ex Input:
[-13.67, -10.677, 143.161, 202.44, 159.612, -30.358, 175.917]

Ex Output:

89.489


