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:
[-6.992, -36.177, -95.203, 87.142]

Ex Output:
-12.808


Ex Input:
[118.783, 191.64, 225.792, 160.903, 209.763, 39.225, 24.607]

Ex Output:
138.673


Ex Input:
[130.24, 7.735, 123.557]

Ex Output:

87.177