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.

[-74.264, 96.188, -6.423, 201.755, 166.517, -96.689, 172.493, 141.825]
75.175