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:
[171.805, 71.031, 36.192, 28.948, -58.045, 53.843]

Ex Output:
50.629


Ex Input:
[207.165, 246.399, 44.821, -21.671]

Ex Output:
119.178


Ex Input:
[232.583, 79.532, -20.355, -54.572, 148.178, 28.968, -89.316, -9.223, 162.433]

Ex Output:

53.136