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:
[207.165, 246.399, 44.821, -21.671]

Ex Output:
119.178


Ex Input:
[224.567, -42.213, 232.017]

Ex Output:
138.124


Ex Input:
[74.744, 191.586]

Ex Output:

133.165