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.

[-24.857, -28.799, 240.99]
62.445

[125.332, 80.443]
102.887

[103.028, 231.486, 24.809]

119.774