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:
[233.742, -71.075]

Ex Output:
81.333

Ex Input:
[162.26, 79.268]

Ex Output:
120.764

Ex Input:
[101.752, -1.441, -81.705, -93.019, 62.029]

Ex Output:
-2.477