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].

[-99, 26, 2, -80, 86, -40, -29, -90, -13, 61]
Output:
[-36.5, 14.0, -39.0, 3.0, 23.0, -34.5, -59.5, -51.5, 24.0]