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: [-7, 40, 98, 92, -81, 78, -22, 21]

SOLUTION: [16.5, 69.0, 95.0, 5.5, -1.5, 28.0, -0.5]

PROBLEM: [-13, 31, 0, 53]

SOLUTION: [9.0, 15.5, 26.5]

PROBLEM: [70, 83, -42, 98, -99, 69, -98, 30, 34, -93, 27, 37, 19, -27, -66]

SOLUTION:
[76.5, 20.5, 28.0, -0.5, -15.0, -14.5, -34.0, 32.0, -29.5, -33.0, 32.0, 28.0, -4.0, -46.5]