The sine of 60 degrees.........is one half the square root of 3..............................

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If a data distribution is approximately normal then about 68 percent of the data values are within one standard deviation of the mean (mathematically, μ ± σ, where μ is the arithmetic mean), about 95 percent are within two standard deviations (μ ± 2σ), and about 99.7 percent lie within three standard deviations (μ ± 3σ ...

Standard deviation - Wikipedia

https://en.wikipedia.org/wiki/Standard_deviation

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Standard deviation - Wikipedia

https://en.wikipedia.org/wiki/Standard_deviation

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If a data distribution is approximately normal then about 68 percent of the data values are within one standard deviation of the mean (mathematically, μ ± σ, where μ is the arithmetic mean), about 95 percent are within two standard deviations (μ ± 2σ), and about 99.7 percent lie within three standard deviations (μ ± 3σ ...

‎Geometric standard deviation · ‎Average absolute deviation · ‎68–95–99.7 rule

Standard Deviation - Robert Niles

www.robertniles.com/stats/stdev.shtml

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The standard deviation is a statistic that tells you how tightly all the various examples are clustered around the mean in a set of data. When the examples are pretty tightly bunched together and the bell-shaped curve is steep, the standard deviation is small. When the examples are spread apart and the bell curve is relatively ...

[PDF]Bell-shaped distribution - UCI

www.ics.uci.edu/~jutts/7-W13/Lecture3Compact.pdf

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Example: A data set consists of heights for the first. 4 students in the ... (Korber, 2001, italics added.)” 11. Describing Spread (Variability):. Range, Interquartile Range and. Standard deviation. • Range = high value – low value. • Interquartile Range (IQR) = .... For any bell-shaped curve, approximately. • 68% of the values fall ...

[PPT]Standard Deviation & The Bell Curve

www.anderson1.k12.sc.us/cms/lib04/SC01000609/.../Standard%20Deviation.pptx

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Students will demonstrate understanding of the calculation of standard deviation and construction of a bell curve. Standard Deviation & The Bell Curve. Standard Deviation. 1st find the variance for a set of data; Variance is the average squared deviation from the mean of a set of data. Computing the Variance. Grades from ...