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: [140.036, 50.806, -61.0, 245.291, 229.038, 204.613, 141.235, 70.274, -28.45, -28.725]

96.312