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.

[17.197, 152.985, 73.815]
81.332

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

[190.848, 71.483, 9.945, -24.166, -1.259, 35.005]

46.976