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.

[-20.702, 4.455, 37.838, 102.751, 231.6, -23.075, 236.527, 227.109, 171.708, 46.239]
101.445

[-13.67, 239.672]
113.001

[-21.669, -73.355, -99.121, 64.896]

-32.312