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: [62.65, 155.504, 55.659, 77.757]

SOLUTION: 87.892

PROBLEM: [-17.682, 37.846, 232.046]

SOLUTION:
84.07