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

Ex Output:
81.286


Ex Input:
[193.711, 110.309, -20.334, 151.607, 158.797, -97.825, -59.931]

Ex Output:
62.333


Ex Input:
[29.63, 110.962, 69.986]

Ex Output:

70.193