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].
Q: [16, 5, -72, -38, -8, 43, 53, 61, -74, -18, -91, -36, 41, 21]
A: 
[10.5, -33.5, -55.0, -23.0, 17.5, 48.0, 57.0, -6.5, -46.0, -54.5, -63.5, 2.5, 31.0]