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: [131.159, 191.815, 192.95, 5.04, -92.196, 15.588, -79.703, -42.256, 106.662]

47.673