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:
[-71.118, 160.927, 230.116, -26.655, -4.297, 64.272, 72.304, 41.517, 242.068]

Ex Output:
78.793


Ex Input:
[-20.155, -42.404]

Ex Output:
-31.28


Ex Input:
[237.815, 247.314, 96.179, -62.425, 212.4, 238.304]

Ex Output:

161.598