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].

Ex Input:
[-80, 99, -49, -90, 63, 15, 39, -5, -17]

Ex Output:
[9.5, 25.0, -69.5, -13.5, 39.0, 27.0, 17.0, -11.0]


Ex Input:
[-42, -27, -37, -63, 89, -61, -68]

Ex Output:
[-34.5, -32.0, -50.0, 13.0, 14.0, -64.5]


Ex Input:
[5, 16, -27]

Ex Output:

[10.5, -5.5]