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: [154.057, 127.625, -90.321, 78.092, 10.459, 13.407, 16.4, -67.357, -95.83, 136.481]

28.301