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: [100.422, 199.731, 138.971, 95.515, 9.517]

SOLUTION: 108.831

PROBLEM: [162.434, 99.656, 86.665, 13.03, 99.225, 43.608, -41.822, 206.671]

SOLUTION: 83.683

PROBLEM: [-15.171, -69.411, 7.713, 87.614, 215.547]

SOLUTION:
45.258