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: [59.291, 108.572, 120.13]
Example Output: 95.998

Example Input: [-7.057, 122.729, -78.932, 52.502, 191.819, 80.994, 29.505, -10.501]
Example Output: 47.632

Example Input: [53.969, 35.428, -38.928, -15.972, 214.296, 69.342, 125.925, 8.745, 175.228, 68.531]
Example Output:
69.656