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: [-37.487, 10.205, 174.167, 19.088, 207.842, -90.906, 187.866, -82.405]

48.546