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.

Example Input: [-82.094, 163.171, -35.384, 69.572]
Example Output: 28.816

Example Input: [65.486, -51.995, 170.628, -23.998, 83.128, -57.38, 130.737, 214.738]
Example Output: 66.418

Example Input: [-16.277, -33.061, -26.18, 140.323, 236.57, -28.594, -42.472, -57.826, 158.577, -49.267]
Example Output:
28.179