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: [130.629, 28.773, 0.572, 111.989, -62.688, 42.132, -0.458, -9.938, 8.206]

27.691