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: [16.184, 166.426, 176.708, 231.047, 36.47, 137.108, 56.406, -64.589, 49.302, 158.147]

96.321