Campbell's father holds just one stock, East Coast Bank (ECB), which he thinks is a very...

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Campbell's father holds just one stock, East Coast Bank (ECB),which he thinks is a very low-risk security. Campbell agrees thatthe stock is relatively safe, but he wants to demonstrate that hisfather's risk would be even lower if he were more diversified.Campbell obtained the following returns data shown for West CoastBank (WCB). Both have had less variability than most other stocksover the past 5 years. Measured by the standard deviation ofreturns, by how much would his father's historical risk have beenreduced if he had held a portfolio consisting of 50% ECB and theremainder in WCB? Enter your answer rounded to two decimal places.Do not enter % in the answer box. For example, if your answer is0.12345 or 12.345% then enter as 12.35 in the answer box.
Year                  ECB                   WCB
2014                  20.00%              25.00%
2015                  -10.00%             15.00%
2016                  35.00%              -5.00%
2017                 -5.00%                -10.00%
2018                  15.00%               35.00%

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Campbell's father holds just one stock, East Coast Bank (ECB),which he thinks is a very low-risk security. Campbell agrees thatthe stock is relatively safe, but he wants to demonstrate that hisfather's risk would be even lower if he were more diversified.Campbell obtained the following returns data shown for West CoastBank (WCB). Both have had less variability than most other stocksover the past 5 years. Measured by the standard deviation ofreturns, by how much would his father's historical risk have beenreduced if he had held a portfolio consisting of 50% ECB and theremainder in WCB? Enter your answer rounded to two decimal places.Do not enter % in the answer box. For example, if your answer is0.12345 or 12.345% then enter as 12.35 in the answer box.Year ECB WCB2014 20.00% 25.00%2015 -10.00% 15.00%2016 35.00% -5.00%2017 -5.00% -10.00%2018 15.00% 35.00%