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].

Example Input: [83, 67, 5, -15]
Example Output: [75.0, 36.0, -5.0]

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

Example Input: [-70, -69, 97, -34, -19, 0, 75, 21, 74, 16, -12, 12, -9]
Example Output:
[-69.5, 14.0, 31.5, -26.5, -9.5, 37.5, 48.0, 47.5, 45.0, 2.0, 0.0, 1.5]