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: [195.441, -73.026, -80.726, 91.359, 38.888, -71.239, -10.157, 25.075, 88.499, 0.619]

20.473