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: [43.85, -69.445, 10.276, 128.513, -12.443, -67.056, 20.736, 80.301, -37.54, 174.27]

27.146