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:
[89.776, -37.895, -45.315, 75.805, 144.052, 150.156]

Ex Output:
62.763


Ex Input:
[159.441, -67.237, 193.65, 206.133, 209.448]

Ex Output:

140.287