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: [166.967, 154.381, -19.741, 157.124]

SOLUTION: 114.683

PROBLEM: [129.453, 232.284, -34.595]

SOLUTION: 109.047

PROBLEM: [236.114, -87.789, 89.346, 88.815]

SOLUTION:
81.622