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: [129.453, 232.284, -34.595]

SOLUTION: 109.047

PROBLEM: [70.496, 183.122, 75.017, -19.287, 53.364, -12.389, 249.47, -88.484, 249.98, 35.226]

SOLUTION: 79.652

PROBLEM: [31.144, 125.262, 172.518, 35.668, -89.2, 68.261, -53.655]

SOLUTION:
41.428