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: [-63.25, 158.312, 6.688, 76.184, -35.6, 121.994, -20.871, 45.703, 22.375, 123.93]

43.546