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  3. Standard deviation - Wikipedia

    en.wikipedia.org/wiki/Standard_deviation

    The standard deviation σ of X is defined as which can be shown to equal. Using words, the standard deviation is the square root of the variance of X . The standard deviation of a probability distribution is the same as that of a random variable having that distribution. Not all random variables have a standard deviation.

  4. Byzantine Empire - Wikipedia

    en.wikipedia.org/wiki/Byzantine_Empire

    Byzantine Empire. The Byzantine Empire, also referred to as the Eastern Roman Empire, was the continuation of the Roman Empire centered in Constantinople during Late Antiquity and the Middle Ages. The eastern half of the Empire survived the conditions that caused the fall of the West in the 5th century AD, and continued to exist until the fall ...

  5. Radar beacon - Wikipedia

    en.wikipedia.org/wiki/Radar_beacon

    Radar beacon (short: racon) is – according to article 1.103 of the International Telecommunication Union's (ITU) ITU Radio Regulations (RR) [1] – defined as "A transmitter-receiver associated with a fixed navigational mark which, when triggered by a radar, automatically returns a distinctive signal which can appear on the display of the ...

  6. The Sopranos - Wikipedia

    en.wikipedia.org/wiki/The_Sopranos

    The Sopranos is an American crime drama television series created by David Chase.The series revolves around Tony Soprano (James Gandolfini), a New Jersey-based Italian-American mobster who struggles to balance his family life with his role as the leader of a criminal organization, which he reluctantly explores during therapy sessions with psychiatrist Jennifer Melfi (Lorraine Bracco).

  7. Capacitor - Wikipedia

    en.wikipedia.org/wiki/Capacitor

    Electronic symbol. In electrical engineering, a capacitor is a device that stores electrical energy by accumulating electric charges on two closely spaced surfaces that are insulated from each other. The capacitor was originally known as the condenser, [1] a term still encountered in a few compound names, such as the condenser microphone.