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].

[70, 83, -42, 98, -99, 69, -98, 30, 34, -93, 27, 37, 19, -27, -66]
[76.5, 20.5, 28.0, -0.5, -15.0, -14.5, -34.0, 32.0, -29.5, -33.0, 32.0, 28.0, -4.0, -46.5]