Definition: 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.
Input: [162.999, -60.454, 163.656, -99.591, -15.11, 216.178, 166.981, 194.967, 5.164]

81.643