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: [139.238, 225.164, -21.563, -22.339, -77.136, 96.772, -40.208, 121.974, 228.852]

Answer: 72.306


Question: [49.035, -81.115, 27.419]

Answer: -1.554


Question: [-16.878, -94.397, -58.691, 131.743, 218.247, 140.732, 133.169, -30.788, 42.957]

Answer:
51.788