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:
[-2.869, -88.698, 21.318]

Ex Output:
-23.416


Ex Input:
[-38.715, 205.647, 66.034, 49.8, -92.051, 111.017, 149.689]

Ex Output:
64.489


Ex Input:
[25.087, 132.133, 94.502, 19.928, 185.568, 214.751]

Ex Output:

111.995