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: [33.697, 209.242, 20.451, 82.093, 248.217, 146.229, -13.425, 24.126, 165.725, 210.947]

112.73