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].

[57, -26, -99, 61, 13, 31]
[15.5, -62.5, -19.0, 37.0, 22.0]

[47, -34, 89, -12, -79, -52, -80, 55, 75, -8, 72, -38, 87, 1, -78]
[6.5, 27.5, 38.5, -45.5, -65.5, -66.0, -12.5, 65.0, 33.5, 32.0, 17.0, 24.5, 44.0, -38.5]

[6, -77, 20]

[-35.5, -28.5]