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.

[165.242, 50.738, -34.087, 77.742, -21.241, -4.541]
38.976

[125.332, 80.443]
102.887

[-47.904, 100.465]

26.28