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: [-94.986, -29.919, 224.315, 25.992, 87.083, 211.521, 9.682, 128.285, 244.936]

89.657