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: [215.854, -43.532, 51.416]

Answer: 74.579


Question: [-6.992, -36.177, -95.203, 87.142]

Answer: -12.808


Question: [208.977, 44.479, 123.76, 31.562, 80.258, -34.378, 186.971, 7.439, -99.637]

Answer:
61.048