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].

[24, 99, 39, -86]
[61.5, 69.0, -23.5]

[91, 3, -59, 63]
[47.0, -28.0, 2.0]

[-20, 26, -20, 26, 29, -90, -61, -57, 100, 42]

[3.0, 3.0, 3.0, 27.5, -30.5, -75.5, -59.0, 21.5, 71.0]