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We found the average return for the S&P 500 from 2010 to 2020 to be 18% with a standard deviation of 25.1%. What is a

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We found the average return for the S&P 500 from 2010 to 2020 to be 18% with a standard deviation of 25.1%. What is a 95% prediction interval for 2021's return? Show all your calculations

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