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.

[113.238, 247.072, -31.448, -33.563, 74.519, 67.841]
72.943

[57.506, 172.357, 191.473, 131.849]
138.296

[118.405, 152.607, 44.588, 232.202, 179.075, 88.648, 113.631, -45.762, 65.225]

105.402