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: [21.531, 221.161, -31.194]

Answer: 70.499


Question: [95.725, 112.04, 231.963]

Answer: 146.576


Question: [-19.439, 177.13, 177.82, 1.818, -41.251, 112.774, -65.485, 124.748, 139.04, 149.461]

Answer:
75.662