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: [54, 27, 20, -9]

SOLUTION: [40.5, 23.5, 5.5]

PROBLEM: [-29, -56, -77, -51, 5, -12, -80]

SOLUTION: [-42.5, -66.5, -64.0, -23.0, -3.5, -46.0]

PROBLEM: [78, -73, -41, -39, 9, 71, 53, 81, -72, -45, 66, 52, 89, -80, 90]

SOLUTION:
[2.5, -57.0, -40.0, -15.0, 40.0, 62.0, 67.0, 4.5, -58.5, 10.5, 59.0, 70.5, 4.5, 5.0]