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: [1.222, 33.339, 163.969]

SOLUTION: 66.177

PROBLEM: [219.769, -36.26, 3.121, -22.5, 124.372]

SOLUTION: 57.7

PROBLEM: [119.45, -89.796, 210.425, -80.255]

SOLUTION:
39.956