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: [150.595, -73.067, 167.41, 98.227, 183.329, 8.67, -59.48, 173.502, 141.087]

87.808