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].

[-86, 77, 13, -63, 66, 91, -69, 55, -98, -22, 61, 53, -61, 49, 97]
[-4.5, 45.0, -25.0, 1.5, 78.5, 11.0, -7.0, -21.5, -60.0, 19.5, 57.0, -4.0, -6.0, 73.0]