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.

[108.26, -20.681, 127.479, -29.352]
46.426

[18.155, 114.069, 197.871, -99.696, 201.18]
86.316

[23.816, -51.452, 120.393, 154.193, 125.215, 15.148, 189.425]

82.391