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.

[219.428, 229.08, 24.616, -83.165, -28.839, 195.219, 170.491, -78.673]
81.02

[61.739, -99.854, -53.677]
-30.597

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

112.337