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: [143.937, 218.668, -88.238, 214.387, 229.552, -17.821, 136.927, -56.889]

97.565