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  2. Ratio - Wikipedia

    en.wikipedia.org/wiki/Ratio

    The ratio of width to height of standard-definition television. In mathematics, a ratio (/ ˈ r eɪ ʃ (i) oʊ /) shows how many times one number contains another. For example, if there are eight oranges and six lemons in a bowl of fruit, then the ratio of oranges to lemons is eight to six (that is, 8:6, which is equivalent to the ratio 4:3).

  3. International Mathematical Olympiad selection process

    en.wikipedia.org/wiki/International_Mathematical...

    The top 30 students from grades 8-11, the top 6 students from grade 12, and an additional 5 girl students from grades 8-11 from each region qualify for writing the INMO, the third stage exam. Stage 3 or Indian National Mathematical Olympiad: The INMO is held on the third Sunday of January at 28 centers across the country. The examination paper ...

  4. The 10 to 1 ratio was an estimate made in 1972; current estimates put the ratio at either 3 to 1 or 1.3 to 1. [301] The total length of capillaries in the human body is not 100,000 km. That figure comes from a 1929 book by August Krogh, who used an unrealistically large model person and an inaccurately high density of capillaries.

  5. Irrational number - Wikipedia

    en.wikipedia.org/wiki/Irrational_number

    [32] The question about the irrationality of Euler's constant γ is a long standing open problem in number theory. [33] Other important numbers which are not known to be irrational include odd zeta constants ζ(5), ζ(7), ζ(9), ... for n > 3 and Catalan's constant β(2). [34]

  6. Random close pack - Wikipedia

    en.wikipedia.org/wiki/Random_close_pack

    Random close packing (RCP) of spheres is an empirical parameter used to characterize the maximum volume fraction of solid objects obtained when they are packed randomly. For example, when a solid container is filled with grain, shaking the container will reduce the volume taken up by the objects, thus allowing more grain to be added to the container.

  7. Standard deviation - Wikipedia

    en.wikipedia.org/wiki/Standard_deviation

    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).

  8. Van der Waals equation - Wikipedia

    en.wikipedia.org/wiki/Van_der_Waals_equation

    Here because is a multivalued function, the integral must be divided into 3 parts corresponding to the 3 real roots of the vdW equation in the form, (,) (this can be visualized most easily by imagining Fig. 1 rotated ); the result is a special case of material equilibrium. [68]

  9. Radiation therapy - Wikipedia

    en.wikipedia.org/wiki/Radiation_therapy

    For children, a typical fraction size may be 1.5 to 1.8 Gy per day, as smaller fraction sizes are associated with reduced incidence and severity of late-onset side effects in normal tissues. In some cases, two fractions per day are used near the end of a course of treatment.