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: [-43.529, 109.435, 160.949, 229.41, -36.645, -42.215, 139.786, 17.927, -93.902]

49.024