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: [50.384, 136.542, -5.113, 192.277, 69.184, 94.828, 198.389, 86.703]

102.899