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: [-93.617, 73.236, -10.334, 148.675, -17.128, 223.898, -51.981, 125.796, 31.407]

47.772