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: [126.026, -59.263, -0.935, 202.244, 116.237, 138.945, -10.301, 160.38]

84.167