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: [-28.799, 227.744, 175.237, -27.797, 11.116, -31.767, 186.255, -39.515]

59.059