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: [-13, 31, 0, 53]

SOLUTION: [9.0, 15.5, 26.5]

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: [-20, 31, -46, 78]

SOLUTION:
[5.5, -7.5, 16.0]