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: [-2, -57, 85, -7, 81, 57, -60, -87, -18]

Answer: [-29.5, 14.0, 39.0, 37.0, 69.0, -1.5, -73.5, -52.5]


Question: [64, -46, 87, -20, -46, -57, -4, -10]

Answer: [9.0, 20.5, 33.5, -33.0, -51.5, -30.5, -7.0]


Question: [8, -84, -69, -40, -20]

Answer:
[-38.0, -76.5, -54.5, -30.0]