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.

[-19.13, 98.86, 158.686, 230.23]
117.161

[110.671, -22.006, 168.421, 152.718, 116.702, -26.669, -55.023, -72.932]
46.485

[132.338, -91.176, -50.214, 244.696, 90.308, 48.237, -28.224, 115.38]

57.668