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: [-65.719, -51.25, 80.704, -20.724, 93.024, -58.518, 99.942, -70.64, 33.337, 149.377]

18.953