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: [-82.17, 5.039, 69.487, 134.879, 144.363, -60.559, 108.061, -94.141, -60.823, -84.012]

8.012