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: [81, 73]

SOLUTION: [77.0]

PROBLEM: [20, -17, 41, -60, 2, 64, 36, 16, -43]

SOLUTION: [1.5, 12.0, -9.5, -29.0, 33.0, 50.0, 26.0, -13.5]

PROBLEM: [27, 86, 69, -37, -47, 73, -11, -33, -17, -42]

SOLUTION:
[56.5, 77.5, 16.0, -42.0, 13.0, 31.0, -22.0, -25.0, -29.5]