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: [188.132, 125.24, 225.85, 36.47, -35.697, -56.987, 4.451, -11.939]

59.44