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:
[108.26, -20.681, 127.479, -29.352]

Ex Output:
46.426


Ex Input:
[78.523, 239.098, 9.698, 69.94]

Ex Output:
99.315


Ex Input:
[145.749, 137.312]

Ex Output:

141.531