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: [95.673, 239.34, -3.591, 0.271, 182.464, 115.131, 157.072]

112.337