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: [-46.263, 155.924, 109.247, -33.261, 221.933, 21.841, -77.08, -89.305]

32.88