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: [8.832, 214.963, 19.142, 138.647, -39.32, 107.345, 42.493, 2.642]

61.843