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].
[-28, -99, 42, -32, -31, 67, 13, 77, 73, 58, 92, 19, -40, 88, 88]