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: [128.152, 95.16, 70.113, -16.853]

SOLUTION: 69.143

PROBLEM: [16.256, 155.71, 43.059, -64.109, -42.445, 78.725, -12.941, 47.497]

SOLUTION: 27.719

PROBLEM: [66.767, -68.103, 119.583, 223.622]

SOLUTION:
85.467