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: [-81.958, 242.122, 193.183, -23.414, -5.145, -50.155, -88.102, 71.984, -62.468, 151.114]

34.716