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:
[51.02, -71.125, 178.19, -7.234, -99.571, -17.215]

Ex Output:
5.677


Ex Input:
[219.428, 229.08, 24.616, -83.165, -28.839, 195.219, 170.491, -78.673]

Ex Output:
81.02


Ex Input:
[-30.66, 134.777, 39.637, -41.053, 60.502, -99.875, -32.055, 51.52, 216.645, 11.994]

Ex Output:

31.143