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:
[-68.429, 130.101, 45.673]

Ex Output:
35.782


Ex Input:
[217.978, 70.977, 31.129, -87.408, -99.013, 249.862, -87.151, 207.527, 43.432]

Ex Output:
60.815


Ex Input:
[-72.984, 128.607, 6.477, -21.627, 234.268, 16.279, 51.947, 104.513, 182.928]

Ex Output:

70.045