I got an answer of 11.88 but apparently the correct answer is 547. Which part of this solution is wrong?
2025-01-13 02:16:35.1736734595
Is this standard deviation calculation correct?
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Looks fine to me. I also got 11.88.
The standard deviation cannot be 547 as the mean plus/minus one standard deviation should include 68% of all results.
Double check you are looking at the right answer in your book.