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:
[242.148, 97.472, -15.031, 246.784, 54.233, -27.114]

Ex Output:
99.749


Ex Input:
[51.02, -71.125, 178.19, -7.234, -99.571, -17.215]

Ex Output:
5.677


Ex Input:
[-7.972, -81.063, 170.32, -72.689, -67.825, -60.014, 181.593, 40.943, -66.977, 164.934]

Ex Output:

20.125