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:
[-66.735, 23.822, -34.5, 118.327, 242.333]

Ex Output:
56.649


Ex Input:
[143.011, 32.952, 55.154]

Ex Output:

77.039