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: [130.586, 81.896, 244.753, -30.811, -67.327, -60.747, 190.813, 137.548, 168.775]

88.387