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: [-17.386, 58.19, -43.108, 165.447, 72.345, 196.793, 14.683, 207.301]
Output:
81.783