You will be given a definition of a task first, then some input of the task.
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].

[79, -33, -87, 93, -84, 57, -15, 35, -31]
Output:
[23.0, -60.0, 3.0, 4.5, -13.5, 21.0, 10.0, 2.0]