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: [-48.12, 192.63, 32.454, 132.703, -26.044, 140.006, -8.624, 38.438]
Example Output: 56.68

Example Input: [187.54, -56.697, 55.301, 235.071, 176.682, 103.554, -35.29, 84.215]
Example Output: 93.797

Example Input: [44.295, 45.986, 194.229, 30.247, 119.935, 195.374, -46.994, -8.725, 119.775, 216.469]
Example Output:
91.059