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: [-58.447, 213.433, 187.859, 103.704]

SOLUTION: 111.637

PROBLEM: [-61.513, 183.183, 185.709, 179.801, 194.827, 91.62, 229.939, -7.981, 123.813, -77.981]

SOLUTION: 104.142

PROBLEM: [-60.619, 42.623]

SOLUTION:
-8.998