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: [-85.928, 228.349, 129.061, 18.667, -88.64, 90.715, 7.149, 41.073, -0.009, -49.058]

29.138