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: [210.345, 91.115]

SOLUTION: 150.73

PROBLEM: [75.879, 43.123]

SOLUTION: 59.501

PROBLEM: [173.909, 74.372, 85.438]

SOLUTION:
111.24