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.

[-51.127, -53.399, -58.094, 172.367, -29.286, 109.468, -34.858, -99.953, 9.617, -8.063]
-4.333

[-19.13, 98.86, 158.686, 230.23]
117.161

[-11.767, -87.662, 136.049, 46.322, 53.541]

27.297