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: [198.475, -38.691]

SOLUTION: 79.892

PROBLEM: [209.13, -12.632, 247.489, 55.492, 8.967, -90.158, 193.743]

SOLUTION: 87.433

PROBLEM: [158.787, 159.947, 57.37, 138.776, 215.233, 82.571, -69.464]

SOLUTION:
106.174