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: [224.963, 135.533, -41.923, -51.494, 28.817, 69.196, 116.938]

68.861