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:
[-78.906, 119.863, 44.561, 1.523]

Ex Output:
21.76


Ex Input:
[116.074, 213.452, 86.981]

Ex Output:
138.836


Ex Input:
[-28.936, -11.062, 34.163, 210.583]

Ex Output:

51.187