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: [69.732, 3.589, -26.138, -71.328, 83.115, -37.521, -68.34, 193.613]

18.34