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: [147.664, 167.561, 244.106, -42.988, 9.425, 79.806, 239.58]

SOLUTION: 120.736

PROBLEM: [20.796, 39.383, -26.46, -27.224, 89.591, 87.502, 211.781, 127.87, 223.38]

SOLUTION: 82.958

PROBLEM: [131.164, 99.999, 138.488, 57.264, -40.069, -82.402, -42.836]

SOLUTION:
37.373