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: [-10.37, -75.168, 32.201, 51.419, 4.792, 175.575, -6.252, 121.019, -88.724, 9.185]

21.368