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: [-96.182, -37.177, 130.645, -44.92, -12.78, 90.335, -99.791, -11.926, 217.275]

SOLUTION: 15.053

PROBLEM: [-17.604, 15.108, 34.328, -94.608]

SOLUTION: -15.694

PROBLEM: [247.927, -57.393, 107.266, 174.764, 72.691, 28.127, 189.231, -78.4, 91.335]

SOLUTION:
86.172