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: [232.014, -52.265]
Example Output: 89.875

Example Input: [42.599, 243.483, 230.824, -47.984, -99.619, 79.861, 143.785, 144.058]
Example Output:
92.126

