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: [188.692, 126.766, -89.321, 187.553, 91.166, -21.606, 12.737, 149.633]

80.703