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: [129.739, 59.856, 188.821, -63.548, -55.058, 153.335, -88.105, 94.101]

52.393