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: [34.678, 109.562]

SOLUTION: 72.12

PROBLEM: [48.462, -80.347, -19.649, 180.664, -24.117]

SOLUTION: 21.003

PROBLEM: [-83.71, 28.913, 11.0]

SOLUTION:
-14.599