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: [-57.634, 64.635, 243.83, 92.355, -47.169, 177.764, 88.867, 226.929]

98.697