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: [122.811, -3.404, 183.502, 88.211, -5.596, -7.52, 174.924, -76.952]

59.497