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: [226.83, -96.423, 91.121, 73.565, 148.922, 140.536, -60.267, -28.614, 233.65, -52.716]

67.66