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: [77, 66, 11]

SOLUTION: [71.5, 38.5]

PROBLEM: [9, 62, 4, -63, -50, 9, -19, -42, -20]

SOLUTION: [35.5, 33.0, -29.5, -56.5, -20.5, -5.0, -30.5, -31.0]

PROBLEM: [44, -92, 38, -80, -10, 41, 11, 99, 15, 30, 77]

SOLUTION:
[-24.0, -27.0, -21.0, -45.0, 15.5, 26.0, 55.0, 57.0, 22.5, 53.5]