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:
[40, 34, -39]

Ex Output:
[37.0, -2.5]


Ex Input:
[72, -80]

Ex Output:
[-4.0]


Ex Input:
[-42, 68, -97, 81, 6, 30, 71, 61, -73]

Ex Output:

[13.0, -14.5, -8.0, 43.5, 18.0, 50.5, 66.0, -6.0]