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:
[135.807, 205.755, 191.805]

Ex Output:
177.789


Ex Input:
[32.131, 116.887, 66.741, 218.719, 106.049, -93.999]

Ex Output:
74.421


Ex Input:
[105.485, 17.963, 152.841, -73.073, 56.422]

Ex Output:

51.928