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: [-57.799, 197.667, 34.767, 50.625, 74.938, 26.508, 195.054, 29.311, 208.064, 33.079]

79.221