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].

[-39, 16, -88, -73, 52, -75, -23, -37, 21]
[-11.5, -36.0, -80.5, -10.5, -11.5, -49.0, -30.0, -8.0]

[7, -23]
[-8.0]

[70, 50, -83, -63, 50, 25, 60, 88, 27, -20, 32, -86, -33]

[60.0, -16.5, -73.0, -6.5, 37.5, 42.5, 74.0, 57.5, 3.5, 6.0, -27.0, -59.5]