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].
One example: [-4, 7, 3]
Solution is here: [1.5, 5]
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.

Now, solve this: [-83, 35, 74, -77, -32, 67, 98, -18, 73]
Solution:
[-24.0, 54.5, -1.5, -54.5, 17.5, 82.5, 40.0, 27.5]