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:
[-15, 5]

Ex Output:
[-5.0]


Ex Input:
[-25, 38, 7, 52, -63, -81, -63, -74, 85, 27, 2]

Ex Output:
[6.5, 22.5, 29.5, -5.5, -72.0, -72.0, -68.5, 5.5, 56.0, 14.5]


Ex Input:
[13, -13, 18, -88, 97, -51, 21]

Ex Output:

[0.0, 2.5, -35.0, 4.5, 23.0, -15.0]