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: [-34.306, 40.947, 218.854, 86.983, 29.356, 72.179, -26.301, 69.421, -55.629, 8.753]

41.026