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: [133.784, 42.281, -25.121, 190.377, 179.979, 210.94, 213.849, 145.965]

136.507