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: [91, 12, -2, 74, -96, 64, 58, -44, -31, 38, 1, -26, -88, -67, 80]

SOLUTION: [51.5, 5.0, 36.0, -11.0, -16.0, 61.0, 7.0, -37.5, 3.5, 19.5, -12.5, -57.0, -77.5, 6.5]

PROBLEM: [40, 34, -39]

SOLUTION: [37.0, -2.5]

PROBLEM: [36, -36, 83, -30, 68, -15, 62, -80, -15, 97, 99, 48, -38]

SOLUTION:
[0.0, 23.5, 26.5, 19.0, 26.5, 23.5, -9.0, -47.5, 41.0, 98.0, 73.5, 5.0]