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:
[146.815, 125.411, 84.472, -63.01, 79.256, -34.213, 248.004, -86.96, -39.397]

Ex Output:
51.153


Ex Input:
[245.2, 202.565]

Ex Output:
223.882


Ex Input:
[121.276, 162.342, -25.015, 13.959, 210.395, 241.291]

Ex Output:

120.708


