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:
[236.959, 159.123, 17.257, 241.561, 119.782, -3.56, -30.957]

Ex Output:
105.738


Ex Input:
[199.153, 182.13, -7.832, -60.259]

Ex Output:
78.298


Ex Input:
[28.703, 26.223, 100.033, -80.326, -33.283, 241.038, 159.239, -82.352, -90.916]

Ex Output:

29.818