Given the task definition, example input & output, solve the new input case.
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].
Example: [-4, 7, 3]
Output: [1.5, 5]
To create the answer, we should first calculate the average of -4 and 7, that is: (-4 + 7 ) / 2 = 1.5, so the first element of the answer is 1.5. Then, we need to calculate the average of 7 and 3, that is: 5. So the second element of the answer is 5.

New input case for you: [-87, 44, 57, 26, 1, 60, 37, 24, 4, -49, -33, -56, 41, -97, 86]
Output:
[-21.5, 50.5, 41.5, 13.5, 30.5, 48.5, 30.5, 14.0, -22.5, -41.0, -44.5, -7.5, -28.0, -5.5]