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: [-57, -27, -20, 4, -82, 58, -39, 92, 64, -68, -21]

SOLUTION: [-42.0, -23.5, -8.0, -39.0, -12.0, 9.5, 26.5, 78.0, -2.0, -44.5]

PROBLEM: [-67, -96, -7, 11]

SOLUTION: [-81.5, -51.5, 2.0]

PROBLEM: [-15, 62, -90]

SOLUTION:
[23.5, -14.0]