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.

Ex Input:
[139.608, 17.516, 100.5, -51.362, 57.462, -77.569, -95.41, -24.339, -96.579]

Ex Output:
-3.353


Ex Input:
[-20.702, 4.455, 37.838, 102.751, 231.6, -23.075, 236.527, 227.109, 171.708, 46.239]

Ex Output:
101.445


Ex Input:
[-4.028, 68.444, 150.786, -22.702, 152.894, 3.998]

Ex Output:

58.232