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: [-28.295, -24.828, -66.96, -12.108, -96.597, 110.99, 172.86, -18.752, 157.717]

SOLUTION: 21.559

PROBLEM: [99.171, 17.131, 87.99, 101.136, 99.884, 238.408, 7.495, -35.896, 63.328]

SOLUTION:
75.405