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:
[85.011, -20.439, 195.195, 114.286]

Ex Output:
93.513


Ex Input:
[88.755, -64.951, 41.008]

Ex Output:
21.604


Ex Input:
[107.711, 223.387, 231.078]

Ex Output:

187.392