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:
[128.916, 203.766]

Ex Output:
166.341


Ex Input:
[95.725, 112.04, 231.963]

Ex Output:
146.576


Ex Input:
[71.005, 83.808, 237.969, 242.406, 159.984]

Ex Output:

159.034