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: [130.57, 157.221, 228.177, 32.361, 166.457]

SOLUTION: 142.957

PROBLEM: [227.404, 94.456, 233.241, 147.762, -31.667, -62.22, -93.912]

SOLUTION: 73.581

PROBLEM: [215.854, -43.532, 51.416]

SOLUTION:
74.579