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: [243.585, 203.853, 7.816, 21.195, -27.97, 109.477, 167.261, 170.464]

111.96