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: [72, -90, -99, -88, -87, -26, -40, -45, 69, 32, 57, 21, -67]

SOLUTION: [-9.0, -94.5, -93.5, -87.5, -56.5, -33.0, -42.5, 12.0, 50.5, 44.5, 39.0, -23.0]

PROBLEM: [10, 69, 6, -80, -39, 74]

SOLUTION: [39.5, 37.5, -37.0, -59.5, 17.5]

PROBLEM: [12, 45]

SOLUTION:
[28.5]