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: [9.392, -80.549]

SOLUTION: -35.579

PROBLEM: [94.752, 94.081, 191.426]

SOLUTION: 126.753

PROBLEM: [209.45, 150.578, 223.793, 129.673, 104.211, 55.63, 103.41, -68.055]

SOLUTION:
113.586