There are two formulae for standard deviation. \(s = \sqrt {\frac{{\sum {{{(X - \bar X)}^2}} }}{{n - 1}}}\) (where n is the sample size). The second formula is a re ...

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The patterns seen in math are also evident on the LTT Reading test (click on tabs to see reading scores) but at mercifully smaller sizes. Since 2012, the 10th percentile reading scores are down 31 ...

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Standard deviation is a measurement of market volatility. Learn how investors use standard deviation in the MoneySense Glossary. Standard deviation (σ) is an investing metric used to measure the ...