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].

[-4, -14, -84, 19, -46, 9, 40, 42, -47]
Output:
[-9.0, -49.0, -32.5, -13.5, -18.5, 24.5, 41.0, -2.5]