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.
[182.854, 113.394, 233.144, 170.266, 40.784, 114.721, -91.394, 108.149]