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:
[-57, -27, -20, 4, -82, 58, -39, 92, 64, -68, -21]

Ex Output:
[-42.0, -23.5, -8.0, -39.0, -12.0, 9.5, 26.5, 78.0, -2.0, -44.5]


Ex Input:
[18, -97, -66, -82, -74, 44, 15, 1, 79, -3]

Ex Output:
[-39.5, -81.5, -74.0, -78.0, -15.0, 29.5, 8.0, 40.0, 38.0]


Ex Input:
[73, 88, -94, -48]

Ex Output:

[80.5, -3.0, -71.0]