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.

[-13.67, 239.672]
113.001

[238.315, 168.986, -67.694]
113.202

[-50.947, -88.879]

-69.913

