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: [56.466, -9.624, -34.641, 10.073, 168.537, 81.175, -98.931]

24.722