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: [85.166, 231.233, -43.17, 185.268, 13.015, 22.189, 224.827, -77.577, 7.108, 9.902]

65.796