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].

[-21, 12, 53, 49, 2, -54, -28, 8, -77, 27, -33]
[-4.5, 32.5, 51.0, 25.5, -26.0, -41.0, -10.0, -34.5, -25.0, -3.0]

[5, 5]
[5.0]

[8, 77, -15, -63, 29, -28, 17, -43, -86, -37, -19, 40, 2]

[42.5, 31.0, -39.0, -17.0, 0.5, -5.5, -13.0, -64.5, -61.5, -28.0, 10.5, 21.0]