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: [-19.769, 147.929, -36.133, 201.287, 28.528, -6.089, 122.533, 127.892, -36.662]

SOLUTION: 58.835

PROBLEM: [84.13, 59.186, 115.606]

SOLUTION: 86.307

PROBLEM: [91.361, 57.187, 120.884, 39.389, -37.188]

SOLUTION:
54.327