How to calculate average standard deviation?

#1
Hello, I would like to compare the average standard deviation scores of Sets A and B (please see below). Anyone knows how to calculate the average standard deviation from a set of standard deviation scores?

Set A of standard deviation scores: 1.29, 0.92, 1.03, 0.94, 1.20, 1.92, 1.07, 0.96

Set B of standard deviation scores: 0.82, 0.88, 0.74, 0.63, 0.71, 0.85, 0.80, 0.67

Thanks a lot!