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: [-61, -4, 59, 97, 77, 15, 50, -66, 99, 90, -77, 53]

SOLUTION: [-32.5, 27.5, 78.0, 87.0, 46.0, 32.5, -8.0, 16.5, 94.5, 6.5, -12.0]

PROBLEM: [28, 0, -2, 18, -73, -90, 19]

SOLUTION:
[14.0, -1.0, 8.0, -27.5, -81.5, -35.5]