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: [-67.466, 148.217, 90.861, 65.54, -82.837, 38.928, -22.938, 135.484]

38.224