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.

[-75.664, 192.225, 2.107, -86.22, -51.11]
-3.732

[134.631, 27.106]
80.868

[225.551, 242.806, 26.087, 12.847]

126.823