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: [-17.026, 165.89]

SOLUTION: 74.432

PROBLEM: [-13.67, 239.672]

SOLUTION: 113.001

PROBLEM: [232.393, 45.335, -50.042, 117.292, 146.083, -14.319, 52.385, 72.571]

SOLUTION:
75.212