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: [28, -83, -37, -51]

SOLUTION: [-27.5, -60.0, -44.0]

PROBLEM: [-50, -74, 52, -21, 29, -11]

SOLUTION: [-62.0, -11.0, 15.5, 4.0, 9.0]

PROBLEM: [-26, -1, 61, 25]

SOLUTION:
[-13.5, 30.0, 43.0]