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: [-44.572, 44.569, -58.461, 207.849, 187.27, -22.635, 112.07, -86.708]

42.423