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: [86, -43, -91, 35, 6, 32, -61, -80, 78]
A: 
[21.5, -67.0, -28.0, 20.5, 19.0, -14.5, -70.5, -1.0]