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:
[15.491, 60.283, 240.958, 155.995, 35.585, -55.875, 82.379, 142.503, 95.176, 85.281]

Ex Output:
85.778

Ex Input:
[237.861, 119.858, -8.107, -30.075, 180.524]

Ex Output:
100.012

Ex Input:
[-81.301, -78.453, 187.627, -34.32, 183.625, 63.108, 63.464, -19.706]

Ex Output:
35.506