21. Data for the last 8 years of stock prices and dividends paid for Poggy, Inc. are listed below: What is the average rate of return for Poggy, Ine. stock over the 8 year time period? 22. Data for the last 8 years of stock prices and dividends paid for Poggy, Inc. are listed below: What is the standard deviation of returns for Poggy, Ine. stock over the 8 year time period? (Compute the standard deviation assuming this is a population of returns, not a sample - that is, use the procedure described in the textbook for calculating the standard deviation of a series of stock returns)