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:
[-3, -21, 57, -70, -97, -90, 31, 83, 68, -34, -65, 13]

Ex Output:
[-12.0, 18.0, -6.5, -83.5, -93.5, -29.5, 57.0, 75.5, 17.0, -49.5, -26.0]


Ex Input:
[-74, -48, -79, -29, -43, -50, 73, -70, 69, -50, 16, 74]

Ex Output:

[-61.0, -63.5, -54.0, -36.0, -46.5, 11.5, 1.5, -0.5, 9.5, -17.0, 45.0]