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:
[245.271, 40.965, 133.913, 212.104]

Ex Output:
158.063


Ex Input:
[15.293, 221.056, 241.387, 81.3, 102.644, 146.885, -33.65, -36.56, -69.176]

Ex Output:
74.353


Ex Input:
[245.487, -82.172, -87.321, -35.714, -51.058, 29.802, -96.787]

Ex Output:

-11.109