Since about 1900,the standard deviation of annual returns on a portfolio of U.S.common stocks has been about:
A) −10%.
B) 6%.
C) 20%.
D) 12%.

Name: Since about 1900,the standard deviation of annual returns on a portfolio of U.S.common stocks has been about: A) −10%. B) 6%. C) 20%. D) 12%.
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Question

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The standard deviation of annual returns on a portfolio of U.S. common stocks has historically been around 20%, reflecting the volatility of the stock market.

Since About 1900,the Standard Deviation of Annual Returns on a Portfolio