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: [65.727, 216.759, 101.145, 91.028]

SOLUTION: 118.665

PROBLEM: [84.091, 17.564, 58.169, 6.482, 53.256, 216.444, 171.489]

SOLUTION: 86.785

PROBLEM: [-19.273, 114.945, -15.716, 108.77, -56.249, 159.262, 26.992, -43.847, 214.335]

SOLUTION:
54.358