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.
[-62.449, 245.008, -20.109, 74.495, 82.036, 223.193, 176.892, 140.704, 187.656]