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: [71.91, 41.513]

SOLUTION: 56.712

PROBLEM: [126.177, 120.225, 231.498, 170.694, 34.361, 101.823, -21.468, 234.339]

SOLUTION: 124.706

PROBLEM: [19.219, -79.042, -90.338, 24.587, 35.328]

SOLUTION:
-18.049