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: [-62.667, 70.273, -14.332, 65.006, -22.429, 180.931, -22.908, 158.395, -27.315, 154.473]

47.943