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:
[153.482, 150.917]

Ex Output:
152.2


Ex Input:
[49.462, -87.869, 36.985, 94.248, 175.789]

Ex Output:
53.723


Ex Input:
[-78.143, 148.741, 215.279, 39.033, -32.046]

Ex Output:

58.573