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: [215.854, -43.532, 51.416]

SOLUTION: 74.579

PROBLEM: [-45.826, -27.376, 126.782, -28.164, 213.819, 186.676]

SOLUTION: 70.985

PROBLEM: [0.401, 29.557, -52.715, -10.743, 150.825, -72.887, 57.093, 232.129, 247.699]

SOLUTION:
64.595