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.

[223.951, 2.518, 140.336, -38.799, 217.497, 212.153, 21.874]
111.361

[14.818, 98.871, -79.033]
11.552

[-1.271, 77.439, -92.943, 48.28, 66.002]

19.501

