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: [-31, 47, -12, 69, 3, 15, 55, 87, 81, 75, -77, -59, -28]

SOLUTION: [8.0, 17.5, 28.5, 36.0, 9.0, 35.0, 71.0, 84.0, 78.0, -1.0, -68.0, -43.5]

PROBLEM: [38, -15, -76]

SOLUTION: [11.5, -45.5]

PROBLEM: [-85, 31, -72, 100, 35]

SOLUTION:
[-27.0, -20.5, 14.0, 67.5]