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.

[-19.64, 5.69, 102.211, 159.062, 7.744, 242.03, 141.431, 105.364, 40.338]
87.137

[118.783, 191.64, 225.792, 160.903, 209.763, 39.225, 24.607]
138.673

[-51.182, 20.064, 37.668, -25.164, 179.779, 26.517, 213.109, 50.245]

56.379