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: [197.301, -51.197, 167.98, 104.697, -8.64, -83.271, 119.387, 35.643, 83.898]

62.866