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: [71.465, 73.852, 33.896, 38.012, 205.464, -37.543, -49.898, 40.256, 196.604, -10.572]

56.154