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: [-6.992, -36.177, -95.203, 87.142]

SOLUTION: -12.808

PROBLEM: [70.282, -54.718, 95.793, 94.043, 183.314]

SOLUTION: 77.743

PROBLEM: [220.691, 167.709, 136.187, 221.869, -5.898]

SOLUTION:
148.112