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].

Let me give you an example: [-4, 7, 3]
The answer to this example can be: [1.5, 5]
Here is why: 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.

OK. solve this:
[-74, 77, 43, 44, -44, 57, -19, -27, 74, -10, -16, -98, 12, -98, 15]
Answer:
[1.5, 60.0, 43.5, 0.0, 6.5, 19.0, -23.0, 23.5, 32.0, -13.0, -57.0, -43.0, -43.0, -41.5]