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: [45.965, 169.829, 169.201, 81.293, 7.549, 223.189, 220.534]

131.08