Ignore the question at the top. All I need to know is how do you get the standard deviation of 0.011789???

2. The table below provides returns on a portfolio along with returns for the corresponding benchmark index for the past eight quarters. The table also provides the difference between portfolio returns and the benchmark index, the average of these differences over the past eight quarters and the standard deviation of these differences. What is the annualized tracking error for this period? All rights reserved