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: [174.36, 9.72, 249.176, 114.153, 222.103, -12.531, -92.444, 246.564]

113.888