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: [101.464, 162.016, -61.742, 49.455, 47.439, 39.174, -30.228, 11.215, -59.37]

28.825