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:
[-3.857, -93.605, 43.857, -73.731, 84.094, -24.492, -41.811, 115.552, 231.429, 130.678]

Ex Output:
36.811

Ex Input:
[87.02, -25.654, -67.979, 52.368, 20.078, 160.939, 4.162, 205.092, -57.092, -68.35]

Ex Output:
31.058

Ex Input:
[55.346, 58.176, -83.298, 157.825, -73.046, 241.84, 153.303, -48.846, 149.972]

Ex Output:
67.919