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]

[20, 17, 12, -4, 33, -71, 17, -43, 72, -53, 80]
[18.5, 14.5, 4.0, 14.5, -19.0, -27.0, -13.0, 14.5, 9.5, 13.5]

[-84, 6, -57, -27, 56, -84, -35, -93, 88, 54, 22, -34, 45]

[-39.0, -25.5, -42.0, 14.5, -14.0, -59.5, -64.0, -2.5, 71.0, 38.0, -6.0, 5.5]