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: [-7.775, 55.997, 216.046]

SOLUTION: 88.089

PROBLEM: [188.006, 117.583, 51.262]

SOLUTION: 118.95

PROBLEM: [132.035, 139.298]

SOLUTION:
135.666

