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: [135.962, 136.509, 77.88, 148.448]

SOLUTION: 124.7

PROBLEM: [-40.509, 201.39]

SOLUTION: 80.44

PROBLEM: [24.058, -52.718, 216.5, 119.501, -96.531]

SOLUTION:
42.162