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, -26, -99, 61, 13, 31]

SOLUTION: [15.5, -62.5, -19.0, 37.0, 22.0]

PROBLEM: [-81, -97, 24, 13, -42, -46, -6, 31]

SOLUTION: [-89.0, -36.5, 18.5, -14.5, -44.0, -26.0, 12.5]

PROBLEM: [-47, 54, -12]

SOLUTION:
[3.5, 21.0]