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.

[-98.361, -84.91]
-91.636

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

[85.662, 10.345, 54.595, 35.65, -90.56]

19.138