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: [39.279, 177.085, 6.468, -68.78, -5.472, -0.806, 235.722, 7.402]

48.862