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: [246.278, 103.84, 214.867, -73.466, 230.048, -72.322, 172.891, 212.306, -78.335, 122.406]

SOLUTION: 107.851

PROBLEM: [84.091, 17.564, 58.169, 6.482, 53.256, 216.444, 171.489]

SOLUTION: 86.785

PROBLEM: [186.429, -91.975, -40.959]

SOLUTION:
17.832