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: [62.942, 159.41, -92.215, 17.404, 115.108, -56.011, 228.911, 249.61]

85.645