Definition: 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.
Input: [103.968, 40.869, 222.248, -58.154, 167.823, 172.128, 82.7, 222.189]

119.221