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: [4.951, 111.209, 212.011, 136.356, -25.242, 107.114, -87.243, 95.788, 112.183, 137.557]

80.468