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# The average annual return over the period 1926-2009 for the s& p 500 is 12.8%, and the standard deviation of returns is 21.4%. based on these numbers, what is a 67% confidence interval for 2010 returns? a) -1.3%, 20.5% b) -8.6%, 34.2% c) -25.8%, 54.7% d) -25.8%, 47.9%   ### Another question on Mathematics Mathematics, 04.02.2019 01:40
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The average annual return over the period 1926-2009 for the s& p 500 is 12.8%, and the standard...
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