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:
[-7.775, 55.997, 216.046]

Ex Output:
88.089


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

Ex Output:
71.419


Ex Input:
[-65.775, 120.875, 106.815, 185.984, 53.595, 218.573, 215.903, -42.121]

Ex Output:

99.231