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:
[245.2, 202.565]

Ex Output:
223.882


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

Ex Output:
83.718


Ex Input:
[32.454, 93.399, -22.196, 220.582]

Ex Output:

81.06


