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:
[138.526, 60.81, 233.845, -33.602, 189.784, 13.888, 184.543, 53.635, 18.299, -87.132]

Ex Output:
77.26


Ex Input:
[172.084, 126.948, 90.757]

Ex Output:
129.93


Ex Input:
[159.818, -89.589, 152.855, -84.473, 171.06]

Ex Output:

61.934