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: [25.407, -63.843, -55.341, 4.483, 38.381, 105.326, -94.523]

-5.73