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The file P02_18.xlsx contains daily values of the Standard & Poor's 500 Index from 1970 to mid-2015. It also contains percentage changes in the index

The file P02_18.xlsx contains daily values of the Standard & Poor's 500 Index from 1970 to mid-2015. It also contains percentage changes in the index from each day to the next. a. Create a histogram of the percentage changes and describe its shape

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