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: [57, 81, -99]

SOLUTION: [69.0, -9.0]

PROBLEM: [33, -76, 34, -35, 27, 74]

SOLUTION: [-21.5, -21.0, -0.5, -4.0, 50.5]

PROBLEM: [23, -77, 0, -11, -69]

SOLUTION:
[-27.0, -38.5, -5.5, -40.0]