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.

[222.94, 54.014, 232.208, -16.089, 214.915, 2.232]
118.37

[-17.604, 15.108, 34.328, -94.608]
-15.694

[139.61, -37.377, 157.306]

86.513