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: [-37.636, 108.306, 31.669, 51.574, 93.897, 137.828, 125.5, -90.822]

52.54