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:
[22.971, 146.947, 84.327, 123.65, -30.682, -43.973, 211.836, 146.398, -65.992]

Ex Output:
66.165


Ex Input:
[-17.026, 165.89]

Ex Output:
74.432


Ex Input:
[127.796, -50.299, -71.687, 177.299, 38.169, 148.763, 154.663, -56.403, -15.171]

Ex Output:

50.348