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:
[21.007, 48.739, -49.831, -22.699]

Ex Output:
-0.696


Ex Input:
[-10.287, -0.47, 195.152, 209.845, -64.645, -82.959, 106.327]

Ex Output:
50.423


Ex Input:
[212.456, 6.972, -59.399, -83.342, 215.038, -97.851]

Ex Output:

32.312