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:
[166.542, 216.326, 98.969, -96.779, 33.532]

Ex Output:
83.718


Ex Input:
[233.742, -71.075]

Ex Output:
81.333


Ex Input:
[230.413, 5.583, 155.666, -27.589]

Ex Output:

91.018