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: [-43.086, 32.505, 185.19, -13.574, 163.145, 176.927, 22.859, -33.324, -48.236]

49.156