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: [57.506, 172.357, 191.473, 131.849]

SOLUTION: 138.296

PROBLEM: [181.256, -78.191, 162.427, -90.527, 123.709, 248.073]

SOLUTION: 91.124

PROBLEM: [-32.31, 239.275, 136.79, 31.099, -54.56, -33.907, 19.999]

SOLUTION:
43.769