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: [-42.956, 89.597, -60.477, 101.972, 77.479]

SOLUTION: 33.123

PROBLEM: [141.597, -13.558, -15.987, -52.44, 77.914]

SOLUTION: 27.505

PROBLEM: [169.826, 15.716, 226.125, -34.81, 229.567, 237.92, 102.999]

SOLUTION:
135.335