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, -16, -81, 59, 20, 38, -29, 79, -21]
Output:
[-47.5, -48.5, -11.0, 39.5, 29.0, 4.5, 25.0, 29.0]