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:
[172.084, 126.948, 90.757]

Ex Output:
129.93


Ex Input:
[38.343, 177.478, 120.174, -74.923, 98.159]

Ex Output:
71.846


Ex Input:
[-30.974, -44.667, 78.4, 122.238, 104.235]

Ex Output:

45.846