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  2. Letter frequency - Wikipedia

    en.wikipedia.org/wiki/Letter_frequency

    The California Job Case was a compartmentalized box for printing in the 19th century, sizes corresponding to the commonality of letters. The frequency of letters in text has been studied for use in cryptanalysis, and frequency analysis in particular, dating back to the Arab mathematician al-Kindi (c. AD 801–873 ), who formally developed the method (the ciphers breakable by this technique go ...

  3. Decimal separator - Wikipedia

    en.wikipedia.org/wiki/Decimal_separator

    In English and many other languages (including many that are written right-to-left), the integer part is at the left of the radix point, and the fraction part at the right of it. [24] A radix point is most often used in decimal (base 10) notation, when it is more commonly called the decimal point (the prefix deci-implying base 10).

  4. Statistics - Wikipedia

    en.wikipedia.org/wiki/Statistics

    For example, Mosteller and Tukey (1977) [22] distinguished grades, ranks, counted fractions, counts, amounts, and balances. ... and use of free statistics software.

  5. Blood alcohol content - Wikipedia

    en.wikipedia.org/wiki/Blood_alcohol_content

    BAC is generally defined as a fraction of weight of alcohol per volume of blood, with an SI coherent derived unit of kg/m 3 or equivalently grams per liter (g/L). Countries differ in how this quantity is normally expressed.

  6. Photon rocket - Wikipedia

    en.wikipedia.org/wiki/Photon_rocket

    A photon rocket is a rocket that uses thrust from the momentum of emitted photons (radiation pressure by emission) for its propulsion. [1] Photon rockets have been discussed as a propulsion system that could make interstellar flight possible during a human lifetime, which requires the ability to propel spacecraft to speeds at least 10% of the speed of light, v ≈ 0.1c = 30,000 km/s. [2]

  7. List of countries by carbon dioxide emissions - Wikipedia

    en.wikipedia.org/wiki/List_of_countries_by...

    List of countries by carbon emissions [4]; Location % of global total Fossil emissions (1,000,000 tons per year) % change from 2000 2023 2000 World 100%: 39,023.94

  8. Usage share of operating systems - Wikipedia

    en.wikipedia.org/wiki/Usage_share_of_operating...

    All the phones have an operating system, but only a fraction of them are smartphones with an OS capable of running modern applications. Currently, 3.1 billion smartphones and tablets are in use across the world (with tablets, a small fraction of the total, generally running the same operating systems, Android or iOS, the latter being more ...

  9. Hispanic and Latino Americans - Wikipedia

    en.wikipedia.org/wiki/Hispanic_and_Latino_Americans

    For instance, their average math and reading NAEP scores were lower than every other group, except African Americans, and have the highest dropout rate of any group, 13% despite decreasing from 24%. [98] To explain these disparities, some scholars have suggested there is a Hispanic "Education Crisis" due to failed school and social policies. [99]