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: [-85.994, 154.061, 28.175, -40.336, -2.305, 168.386, 140.88, 163.4]

65.783