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The average annual return over the period 1926-2009 for the S&P 500 is 11.5%, and the standard deviation of returns is 20.7. Based on these

The average annual return over the period 1926-2009 for the S&P 500 is 11.5%, and the standard deviation of returns is 20.7. Based on these numbers, what is a 67% confidence interval for 2010 returns?

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