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: [159.381, -84.046]

SOLUTION: 37.668

PROBLEM: [223.951, 2.518, 140.336, -38.799, 217.497, 212.153, 21.874]

SOLUTION: 111.361

PROBLEM: [-3.302, 23.685, 69.661, 74.979, -46.96]

SOLUTION:
23.613