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: [202.708, 225.584, 62.673, 201.283, 65.287, 102.764, 213.812, 241.877, -43.051]

141.437