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: [102.962, -12.02, 181.008, -23.382, 39.984, -58.016, 132.51, 21.728, 160.143]

60.546