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: [-7.319, -34.129, 192.024, 208.682, -74.814, -11.554, -30.72, 142.768]

48.117