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: [82.992, 235.629, -36.094, -43.326, 27.531, -12.091, 212.495, 34.388]
Example Output: 62.69

Example Input: [231.352, -24.17]
Example Output: 103.591

Example Input: [-91.008, 169.514, 49.749, 150.994, -11.229, 187.64, 162.395, 243.206]
Example Output:
107.658