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.

[-1.31, 169.522, -26.172, 111.289]
63.332

[73.603, -84.154, 222.739, 205.594, 215.842]
126.725

[-17.038, 13.314, 15.266, 25.245, 221.697, 66.588, 224.63, 72.309, 232.85]

94.985