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: [-39, -78, -10, -56, 67, 4, 97, 31]

SOLUTION: [-58.5, -44.0, -33.0, 5.5, 35.5, 50.5, 64.0]

PROBLEM: [-68, -9, -91, -69, -63, -48, -52, -57, -56, -85, 75, -19]

SOLUTION: [-38.5, -50.0, -80.0, -66.0, -55.5, -50.0, -54.5, -56.5, -70.5, -5.0, 28.0]

PROBLEM: [51, -22, -43, 41]

SOLUTION:
[14.5, -32.5, -1.0]