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: [63.769, 0.733, -71.174, 44.718, 121.724, -48.321, 204.745, -69.556]

30.83