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: [237.58, 4.466, -35.92, 21.365, -66.51, 84.583, -3.453, 120.534, 116.163, 48.733]

52.754