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:
[129.453, 232.284, -34.595]

Ex Output:
109.047


Ex Input:
[229.461, -89.251, 170.954]

Ex Output:
103.721


Ex Input:
[8.563, 200.478, 83.435]

Ex Output:

97.492