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: [137.543, 163.833, -74.02, 89.643, -93.579, -5.901, 16.248, 147.883]

47.706