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: [140.279, -94.178, 192.832, -89.928, 34.417, -79.944, 111.457, -72.451]

17.81