In this task you are given a list of numbers and you need to find the average of each two consecutive values. The average of two numbers a and b is calculated as: (a + b) /2. The output should be a list of the averages of each two consecutive values. A list is presented with two brackets and comma-separated values, like: [1,2,3].
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Question: [-80, 99, -49, -90, 63, 15, 39, -5, -17]

Answer: [9.5, 25.0, -69.5, -13.5, 39.0, 27.0, 17.0, -11.0]


Question: [-31, 21, -23]

Answer: [-5.0, -1.0]


Question: [56, 27, -47, -53, 81]

Answer:
[41.5, -10.0, -50.0, 14.0]