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.

[-31.252, 246.934, 96.512, 19.356, -50.759, 134.528, 176.914, 17.007, 171.802]
86.782

[26.595, 220.402, -36.236, -79.382, -17.51, -71.282]
7.098

[94.444, -87.999, -40.994, -23.087]

-14.409