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: [-55.627, -50.2, 233.087, 168.443, 9.002, -14.155, -58.903]

33.092