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: [-20.611, 25.266, 23.431, -15.88, 6.042, 205.819, 86.474, 92.211]

50.344