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: [86, -66, -60]

SOLUTION: [10.0, -63.0]

PROBLEM: [55, -33, 9, 23, -18, -6, -90, -6, -78]

SOLUTION: [11.0, -12.0, 16.0, 2.5, -12.0, -48.0, -48.0, -42.0]

PROBLEM: [88, -93, 14, -67, -3, 61, 42, -57, -81, 5, -19, -10, 88, 25]

SOLUTION:
[-2.5, -39.5, -26.5, -35.0, 29.0, 51.5, -7.5, -69.0, -38.0, -7.0, -14.5, 39.0, 56.5]