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:
[199.974, 2.205, 197.996, 172.426, 182.153, 42.045, 53.238, 18.021, 83.903]

Ex Output:
105.773


Ex Input:
[118.319, 70.462]

Ex Output:
94.39


Ex Input:
[-66.387, 135.639, 182.921, 175.573, 105.67, -29.751, 156.67, 83.119, 19.538]

Ex Output:

84.777