TASK DEFINITION: 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].
PROBLEM: [20, 17, 12, -4, 33, -71, 17, -43, 72, -53, 80]

SOLUTION: [18.5, 14.5, 4.0, 14.5, -19.0, -27.0, -13.0, 14.5, 9.5, 13.5]

PROBLEM: [83, -58]

SOLUTION: [12.5]

PROBLEM: [65, -7, 19, 28, 85, 11, 98, -86, -30, -43, 53, -67]

SOLUTION:
[29.0, 6.0, 23.5, 56.5, 48.0, 54.5, 6.0, -58.0, -36.5, 5.0, -7.0]