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: [-24.069, 49.942, -56.199, 147.337, 81.429, 198.62, -91.886, 33.842, -16.712, -51.661]

SOLUTION: 27.064

PROBLEM: [-63.278, 115.92, 179.699, 73.157]

SOLUTION: 76.374

PROBLEM: [215.294, 121.402, 83.177]

SOLUTION:
139.958