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: [-90, 40, 90]

SOLUTION: [-25.0, 65.0]

PROBLEM: [63, 44, -32, 39, -3, 79, 76, -74, 57, -73, -42]

SOLUTION: [53.5, 6.0, 3.5, 18.0, 38.0, 77.5, 1.0, -8.5, -8.0, -57.5]

PROBLEM: [-57, -91, 33]

SOLUTION:
[-74.0, -29.0]