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: [224.899, 183.278, 62.915, 74.438, 96.145, 181.083, 30.731, -27.485]

103.25