Definition: 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.
Input: [-3.704, -12.567, -50.458, 112.248, 53.058, 137.187, 5.394, -18.624, -64.728, 67.38]

22.519