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.

[-72.554, 9.809, 27.09, 190.698]
38.761

[245.271, 40.965, 133.913, 212.104]
158.063

[224.567, -42.213, 232.017]

138.124