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: [-27.22, -27.244, -20.9, -41.079, 74.415, 30.173, 196.984, 218.79]

50.49