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: [117.079, 249.28, 9.217, -86.446, -49.06, 73.452, 202.218, 118.516]

79.282