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: [-100, 68, -69, 30]

SOLUTION: [-16.0, -0.5, -19.5]

PROBLEM: [-100, 41, -68, -31, -71, -40, 77]

SOLUTION: [-29.5, -13.5, -49.5, -51.0, -55.5, 18.5]

PROBLEM: [99, 57, -35]

SOLUTION:
[78.0, 11.0]