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  2. 68–95–99.7 rule - Wikipedia

    en.wikipedia.org/wiki/68–95–99.7_rule

    In statistics, the 68–95–99.7 rule, also known as the empirical rule, and sometimes abbreviated 3sr or 3 σ, is a shorthand used to remember the percentage of values that lie within an interval estimate in a normal distribution: approximately 68%, 95%, and 99.7% of the values lie within one, two, and three standard deviations of the mean ...

  3. Hyundai Sigma engine - Wikipedia

    en.wikipedia.org/wiki/Hyundai_Sigma_engine

    The G6AU and G6CU (both also called the 3.5 D ) are the large 3,497 cc (3.5 L; 213.4 cu in) versions of the Sigma engine. Bore and stroke are both larger at 93 mm × 85.8 mm (3.66 in × 3.38 in), respectively.

  4. Standard deviation - Wikipedia

    en.wikipedia.org/wiki/Standard_deviation

    For example, each of the three populations {0, 0, 14, 14}, {0, 6, 8, 14} and {6, 6, 8, 8} has a mean of 7. Their standard deviations are 7, 5, and 1, respectively. The third population has a much smaller standard deviation than the other two because its values are all close to 7.

  5. Normal distribution - Wikipedia

    en.wikipedia.org/wiki/Normal_distribution

    About 68% of values drawn from a normal distribution are within one standard deviation σ from the mean; about 95% of the values lie within two standard deviations; and about 99.7% are within three standard deviations. [8] This fact is known as the 68–95–99.7 (empirical) rule, or the 3-sigma rule.

  6. 2,3,7,8-Tetrachlorodibenzofuran - Wikipedia

    en.wikipedia.org/wiki/2,3,7,8-tetrachlorodibenzo...

    2,3,7,8-Tetrachlorodibenzofuran (TCDF) is a polychlorinated dibenzofuran with a chemical formula of C 12 H 4 Cl 4 O. TCDF is part of the chlorinated benzofuran (CDF) family that contains between 1 and 8 chlorine atoms attached to the parent dibenzofuran ring system. The CDF family includes 135 compounds, of which only a few have been studied.

  7. What do teens mean when they say ‘sigma’? - AOL

    www.aol.com/news/teens-mean-sigma-210752971.html

    Sigma males are “considered ‘equal’ to Alphas on the hierarchy but live outside of the hierarchy by choice,” reads the website. Urban Dictionary adds that sigma “is what all 10 year olds ...

  8. Structural similarity index measure - Wikipedia

    en.wikipedia.org/wiki/Structural_similarity...

    The resultant SSIM index is a decimal value between -1 and 1, where 1 indicates perfect similarity, 0 indicates no similarity, and -1 indicates perfect anti-correlation. For an image, it is typically calculated using a sliding Gaussian window of size 11x11 or a block window of size 8×8.

  9. Ford Zetec engine - Wikipedia

    en.wikipedia.org/wiki/Ford_Zetec_engine

    The advanced Zetec-SE (sometimes badged as Zetec-S) was developed in collaboration with Yamaha and Mazda, under the Sigma codename. It ranges in size from 1.2 to 1.7 L (1,242 to 1,679 cc). It ranges in size from 1.2 to 1.7 L (1,242 to 1,679 cc).