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: [176.017, -45.57]

SOLUTION: 65.224

PROBLEM: [73.331, 85.459, 59.798, -35.019]

SOLUTION: 45.892

PROBLEM: [86.502, -56.025, -44.049, -34.684, 4.776, -57.238, 20.845, 217.299, 23.387]

SOLUTION:
17.868