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].

[-83, -27, -99, 92, -94, -24, -40, -68, -44, -70, 15, 80, -62, -39, 89]
[-55.0, -63.0, -3.5, -1.0, -59.0, -32.0, -54.0, -56.0, -57.0, -27.5, 47.5, 9.0, -50.5, 25.0]