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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. Statistics - Wikipedia

    en.wikipedia.org/wiki/Statistics

    Download as PDF; Printable version; ... ranks, counted fractions, counts, amounts, and balances. Nelder (1990) ... and use of free statistics software.

  4. Sound transmission class - Wikipedia

    en.wikipedia.org/wiki/Sound_transmission_class

    Sound Transmission Class (or STC) is an integer rating of how well a building partition attenuates airborne sound.In the US, it is widely used to rate interior partitions, ceilings, floors, doors, windows and exterior wall configurations.

  5. High-frequency trading - Wikipedia

    en.wikipedia.org/wiki/High-frequency_trading

    High-frequency traders move in and out of short-term positions at high volumes and high speeds aiming to capture sometimes a fraction of a cent in profit on every trade. [6] HFT firms do not consume significant amounts of capital, accumulate positions or hold their portfolios overnight. [10]

  6. 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.

  7. 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]