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.
[65.84, -36.5, 22.876, 233.708, 201.367, -94.915, 230.566, 53.031, 65.583]