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

[135.575, 134.352, 209.54, 199.614, 87.027, 215.933, 49.266, 167.288, 164.589]
151.465

[-80.155, 77.691, 229.301, -44.331, -32.834, -20.125, 241.433, 73.598, 40.039]

53.846