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:
[141.597, -13.558, -15.987, -52.44, 77.914]

Ex Output:
27.505


Ex Input:
[237.501, 67.08, 13.857]

Ex Output:
106.146


Ex Input:
[188.379, 8.747, -6.922, 52.942, 11.742]

Ex Output:

50.978