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: [17.197, 152.985, 73.815]

SOLUTION: 81.332

PROBLEM: [70.568, -80.778]

SOLUTION: -5.105

PROBLEM: [179.839, -8.956, -55.88, -15.586]

SOLUTION:
24.854