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.
[55.865, 240.044, 196.085, 51.754, 162.689, 107.929, 11.781, 115.868]