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: [119.685, 160.143, -82.61, -68.322, -60.592, 214.065, 20.136, 136.226]

54.841