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I'm not getting the same answer as the book, under the Variance Standard Deviation sections. Here is what I did. What am I doing wrong?

I'm not getting the same answer as the book, under the Variance Standard Deviation sections. Here is what I did. What am I doing wrong?

9.Prices of Silver and TinThe following data show the price of silver and the price of tin over a recent 9-year period. Find the range, variance, and standard deviation. Which data set is more variable?

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