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:
[-17.141, 203.132, -6.872, 155.222, -99.642]

Ex Output:
46.94


Ex Input:
[-67.542, 65.934, 223.305, 25.694, 159.037]

Ex Output:
81.286


Ex Input:
[49.893, 165.772, 226.448]

Ex Output:

147.371