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: [-72.413, -92.68, -65.06, -7.577, -31.428, -34.342, 238.388, 69.535, 2.264]

0.743