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: [-82.4, 88.88, 42.677, -32.502, 158.793, 70.635, 180.965]

61.007