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: [45.549, 93.19, 223.167, 128.466, 154.995, 45.222, 197.511, -54.732, 130.321]

107.077