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:
[166.967, 154.381, -19.741, 157.124]

Ex Output:
114.683


Ex Input:
[245.466, 19.262, 199.878]

Ex Output:
154.869


Ex Input:
[55.77, -79.972, 214.672]

Ex Output:

63.49