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.

[-18.796, 194.818]
88.011

[188.006, 117.583, 51.262]
118.95

[-73.462, 3.395, 34.661, 125.56, 36.342, 77.376, 12.075, -13.797]

25.269