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].
Q: [-43, 83, -34, 5, -55, 22, 69, -90, -9, -71]
A: 
[20.0, 24.5, -14.5, -25.0, -16.5, 45.5, -10.5, -49.5, -40.0]