a. Compute the average return for each of the assets from to ​(the Great​ Depression). The average return for the​ S&P 500 was nothing. ​(Round to five decimal​ places.) The average return for the small stocks was nothing. ​(Round to five decimal​ places.) The average return for the corporate bonds was nothing. ​ (Round to five decimal​ places.) The average return for the world portfolio was nothing. ​(Round to five decimal​ places.) The average return for the Treasury bills was nothing. ​(Round to five decimal​ places.) The average for the CPI was nothing. ​(Round to five decimal​ places.) b. Compute the standard deviation for each of the assets from to . The standard deviation for the​ S&P 500 was nothing. ​(Round to four decimal​ places.) The standard deviation for the small stocks was nothing. ​(Round to four decimal​ places.) The standard deviation for the corporate bonds was nothing. ​(Round to four decimal​ places.) The standard deviation for the world portfolio was nothing. ​(Round to four decimal​ places.) The standard deviation for the Treasury bills was nothing. ​ (Round to four decimal​ places.) The standard deviation for the CPI was nothing. ​ (Round to four decimal​ places.)