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.

[-3.857, -93.605, 43.857, -73.731, 84.094, -24.492, -41.811, 115.552, 231.429, 130.678]
36.811

[-45.201, 161.25, -67.093, 105.259, 110.499, 224.516, -55.166, 11.51]
55.697

[97.555, 155.313, 12.48]

88.449