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: [-31, 21, -23]

Answer: [-5.0, -1.0]


Question: [-74, -2]

Answer: [-38.0]


Question: [-20, -30, -59, 55, -98, -49, -64, 80, -21, -90, 81]

Answer:
[-25.0, -44.5, -2.0, -21.5, -73.5, -56.5, 8.0, 29.5, -55.5, -4.5]