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: [57.506, 172.357, 191.473, 131.849]

Answer: 138.296


Question: [70.485, 231.704, -98.046, -30.011, 80.665, 168.282, 224.41]

Answer: 92.498


Question: [-40.246, -7.512, 174.245, -98.6]

Answer:
6.972