Wuine that your uncie holds just one stock, East Coast Bank (ECB), which he thinks has very little risk. You agree that the stock is Relutively safe, but you want to demonstrate that his risk would be even lower if be were more diversified. You obtain the following returni data lor Weat Coast Bank (WCB). Both banks have had less variability than most other stocks over the past 5 yeark. Measured by the mandurd deviation of rehurs, by how much would your unclo's risk bave been reduced if he bad held a portfolio consisting of 49 s in ECB and the remainder in WCB? (Hint: Use the sample standard deviation formula.) Do not round your intermediate calculations Standard deviation =22.64%22.64% a. 3.2994 b, 3,73%