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: [-19.439, 177.13, 177.82, 1.818, -41.251, 112.774, -65.485, 124.748, 139.04, 149.461]

75.662