TASK 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.
PROBLEM: [120.682, 53.847]

SOLUTION: 87.264

PROBLEM: [100.422, 199.731, 138.971, 95.515, 9.517]

SOLUTION: 108.831

PROBLEM: [229.103, 155.669]

SOLUTION:
192.386