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: [171.439, 0.981, 42.253, 239.995, 129.938, -67.125, -69.565, -53.374, -51.357]

SOLUTION: 38.132

PROBLEM: [51.372, 141.276, 8.131, 168.539, 151.323]

SOLUTION: 104.128

PROBLEM: [-56.705, -84.579, 55.818, 22.474, 152.855, 132.182]

SOLUTION:
37.008