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:
[159.381, -84.046]

Ex Output:
37.668


Ex Input:
[135.807, 205.755, 191.805]

Ex Output:
177.789


Ex Input:
[82.878, -71.323, 6.874, 189.524, -80.172, -36.084, 163.231, 57.496, 93.812]

Ex Output:

45.137