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: [-84.662, -43.609, 92.367, 245.742, 129.135, 238.401, 234.962, 246.221]

132.32