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: [-69.698, 181.415, -43.045, 160.857]

SOLUTION: 57.382

PROBLEM: [120.236, 116.311, -13.268]

SOLUTION: 74.426

PROBLEM: [111.771, 111.326]

SOLUTION:
111.548