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: [-88.151, 166.022, 32.626, 207.217, -72.572, -26.993, 93.191, 83.226, -73.248]

35.702