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: [74.43, 138.738, 114.237, 138.845, 188.957, 103.103, -43.988, -68.085, 157.274]

Answer: 89.279


Question: [227.404, 94.456, 233.241, 147.762, -31.667, -62.22, -93.912]

Answer: 73.581


Question: [153.723, 20.213, 185.644, 162.271, 132.806, 231.388, 157.011, -11.903, 171.249]

Answer:
133.6