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: [-63.155, -44.527, -20.524, 132.804, 26.494, -35.069, 224.395, 173.423]

49.23