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:
[226.287, 114.252, -53.47, 8.606, 234.708, -31.872, 163.615]

Ex Output:
94.589


Ex Input:
[80.346, 228.37, 18.978, -42.02]

Ex Output:

71.419


