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: [73.736, 129.162, 135.799, 133.153, -76.861, 95.336, 62.56, 7.288]

70.022