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].

[74, -35, -92, -40, 97]
[19.5, -63.5, -66.0, 28.5]

[82, -6, -31, 31, 30]
[38.0, -18.5, 0.0, 30.5]

[3, 13, 91, 49, -53, -24, -31, -80, 83]

[8.0, 52.0, 70.0, -2.0, -38.5, -27.5, -55.5, 1.5]