Question: please show how to get this answer, thanks! 19. Given the following historical returns, what is the standard deviation? Year 1-30%; year 2-15%; year 3--10%;

please show how to get this answer, thanks!
19. Given the following historical returns, what is the standard deviation? Year 1-30%; year 2-15%; year 3--10%; year 4-18%; year 5-2%. a. about 3% b. about 10% C. about 16% d, about 32% e. None of the above
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