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standard deviation formula

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Returns for the Shields Company over the last 3 years are shown below. What's the standard deviation of Shields' returns? (Hint: This is a sample, not a complete population, so the sample standard deviation formula should be used.)

Year
Return

2006
21.50%

2005
-12.50%

2004
24.20%

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Solution Summary

Apply the standard deviation formula for this case.

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