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: [-43.388, -60.347, 30.261, 69.663, -10.386, 32.761, -50.061, 141.037]

13.692