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: [179.344, 197.418, 69.052, -71.022, 128.196, -57.681, 120.123, -47.738]

64.712