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: [-58.012, 129.229, -59.507, 151.245, 192.438, -46.879, -95.171]

30.478