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]
Example solution: [1.5, 5]
Example explanation: 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.

Problem: [0, -40, -5, 21, 41, -19, 55, -90, 21, -6, -95, -97, -19, -51, -91]

Solution: [-20.0, -22.5, 8.0, 31.0, 11.0, 18.0, -17.5, -34.5, 7.5, -50.5, -96.0, -58.0, -35.0, -71.0]