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: [231.159, 217.795, 230.676, -11.951, -82.697, 31.413]

SOLUTION: 102.732

PROBLEM: [78.523, 239.098, 9.698, 69.94]

SOLUTION: 99.315

PROBLEM: [100.915, 12.36]

SOLUTION:
56.638