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:
[21.723, 130.05, 75.095]

Ex Output:
75.623


Ex Input:
[-40.246, -7.512, 174.245, -98.6]

Ex Output:
6.972


Ex Input:
[147.702, 248.833, 214.408, 139.508, 150.178, 122.644, 239.392]

Ex Output:

180.381