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: [23.616, 20.954, 226.021, 221.052, 209.716, 195.313, 221.743]

159.774