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: [12.756, -0.667, 72.255, 112.734, 52.952, -73.403, -33.839, 71.471, -44.483, 133.245]

30.302