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:
[229.461, -89.251, 170.954]

Ex Output:
103.721


Ex Input:
[112.53, -67.079, 177.313, 230.482, 57.316, -37.564]

Ex Output:
78.833


Ex Input:
[225.697, 75.029]

Ex Output:

150.363