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.

[-20.155, -42.404]
-31.28

[201.917, 240.159, 36.615]
159.564

[208.948, -27.477, 19.597, 87.978, 235.717, 131.297, 25.116, 54.348, 174.277, 179.787]

108.959