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: [93.433, 148.366, 19.269]
Example Output: 87.023

Example Input: [-50.144, 0.802]
Example Output: -24.671

Example Input: [194.072, 19.102, -63.7, -10.9]
Example Output:
34.643