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: [-2.869, -88.698, 21.318]

Answer: -23.416


Question: [-32.499, 21.999, 235.435, 58.638, -57.806, 224.947, 74.782]

Answer: 75.071


Question: [31.173, 213.81]

Answer:
122.492