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: [-55.913, 203.771, 94.962, 233.852, 51.049, 89.534, -50.709, 158.968, -25.296, 104.165]

80.438