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.
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Question: [-28.295, -24.828, -66.96, -12.108, -96.597, 110.99, 172.86, -18.752, 157.717]

Answer: 21.559


Question: [-69.698, 181.415, -43.045, 160.857]

Answer: 57.382


Question: [-94.132, 34.256, -10.866]

Answer:
-23.581