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: [-81.432, -63.059, 150.144, 55.203, 215.405, -89.797, 72.946]

SOLUTION: 37.059

PROBLEM: [61.761, 6.557, -93.386, -74.064, 33.4, 141.295]

SOLUTION: 12.594

PROBLEM: [150.321, 169.658, 221.448, 54.785, 160.245, 9.534, 78.865, 229.753, 225.969]

SOLUTION:
144.509