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:
[53.391, 118.782, 102.742]

Ex Output:
91.638


Ex Input:
[60.02, -66.628, -95.571, 114.26, 109.577, 141.08, 154.303, 228.454, 46.856, 7.365]

Ex Output:
69.972


Ex Input:
[-48.035, 125.922, -97.518]

Ex Output:

-6.544