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


question:
[-42, 68, -97, 81, 6, 30, 71, 61, -73]
answer:
[13.0, -14.5, -8.0, 43.5, 18.0, 50.5, 66.0, -6.0]


question:
[-86, -19]
answer:

[-52.5]