Detailed Instructions: 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.
See one example below:
Problem: [1,3,5]
Solution: 3.000
Explanation: The mean of the input list is (1+3+5)/3, which equals 3. This is a good example.

Problem: [20.849, -67.295, -22.337, 122.368, 173.519]
Solution:
45.421