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:
[120.236, 116.311, -13.268]

Ex Output:
74.426


Ex Input:
[125.67, 5.514, 161.93, 107.05, 118.949, 233.815, 230.211]

Ex Output:
140.448


Ex Input:
[97.557, -40.725]

Ex Output:

28.416