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: [36.398, -99.571, -52.167, 120.272, 187.047, 150.904, -73.368, 76.442]

43.245