Business, 02.03.2020 21:17 fluffykitty21

Assume that your uncle holds just one stock, East Coast Bank (ECB), which he thinks has very little risk. You agree that the stock is relatively safe, but you want to demonstrate that his risk would be even lower if he were more diversified. You obtain the following returns data for West Coast Bank (WCB). Both banks have had less variability than most other stocks over the past 5 years. Measured by the standard deviation of returns, by how much would your uncle's risk have been reduced if he had held a portfolio consisting of 57% in ECB and the remainder in WCB? (Hint: Use the sample standard deviation formula.)

Year ECB WCB

2007 40.00% 40.00%
2008 -10.00% 15.00%
2009 35.00% -5.00%
2010 -5.00% -10.00%
2011 15.00% 35.00%
Average return 15.00% 15%
Standard deviation 22.64% 22.64%

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Assume that your uncle holds just one stock, East Coast Bank (ECB), which he thinks has very little...