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

[246.744, 206.484, 194.841]
216.023

[-78.024, 43.878, 114.885]

26.913