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

[26.595, 220.402, -36.236, -79.382, -17.51, -71.282]
7.098

[148.279, 68.633, 123.81]

113.574