instruction:
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.
question:
[-20.155, -42.404]
answer:
-31.28


question:
[-50.144, 0.802]
answer:
-24.671


question:
[173.696, 61.348, 1.068, 139.875, -11.885, 214.671, 180.011, 82.018, 111.482]
answer:

105.809