The scroll down option for the second question is population/universe/sample

4. Measuring standalone risk using realized data Returns earned over a given time period are called realized returns. Historical data on realized returns is often used to estimate future results. Analysts across companies use realized stock returns to estimate the risk of a stock. Consider the case of Blue Llama Mining Inc. (BLM): Five years of realized returns for BLM are given in the following table. Remember: 1. While BLM was started 40 years ago, its common stock has been publicly traded for the past 25 years. 2. The returns on its equity are calculated as arithmetic returns. 3. The historical returns for BLM for 2012 to 2015 are: 2012 20.00% 2013 13.60% 2014 24.00% 2015 33.60% 2016 10.40% Stock return Given the preceding data, the average realized return on BLM's stock is of BLM's historical returns. Based on this conclusion, the standard deviation of BLM's The preceding data series represents historical returns is If investors expect the average realized return from 2012 to 2016 on BLM's stock to continue into the future, its coefficient of variation (CV) will be