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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, 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, respectively.

  3. Binary prefix - Wikipedia

    en.wikipedia.org/wiki/Binary_prefix

    For example, the IBM 701 (1952) used a binary methods and could address 2048 words of 36 bits each, while the IBM 702 (1953) used a decimal system, and could address ten thousand 7-bit words. By the mid-1960s, binary addressing had become the standard architecture in most computer designs, and main memory sizes were most commonly powers of two.

  4. Demographics of Hispanic and Latino Americans - Wikipedia

    en.wikipedia.org/wiki/Demographics_of_Hispanic...

    In 2000, about 530,000 Hispanics and Latinos 16–19 years of age were high school dropouts, yielding a dropout rate of 21.1 percent for all Hispanics and Latinos. [33] 11 percent of Hispanics/Latinos have earned a bachelor's degree or higher, compared with 17 percent of non-Hispanic blacks, 30 percent of non-Hispanic whites, and 49 percent of ...

  5. List of economic expansions in the United States - Wikipedia

    en.wikipedia.org/wiki/List_of_economic...

    However, private economic activity expanded at a brisk pace throughout this period. The expansion lasted just over three years, followed by another brief recession in late 1948. Oct 1949–. July 1953. 45. +4.4%. +6.9%. The United States exited recession in late 1949, and another robust expansion began.

  6. Currency - Wikipedia

    en.wikipedia.org/wiki/Currency

    A currency [a] is a standardization of money in any form, in use or circulation as a medium of exchange, for example banknotes and coins. [1] [2] A more general definition is that a currency is a system of money in common use within a specific environment over time, especially for people in a nation state. [3]

  7. Letter frequency - Wikipedia

    en.wikipedia.org/wiki/Letter_frequency

    0.44%. 0.44. Letter frequency is the number of times letters of the alphabet appear on average in written language. Letter frequency analysis dates back to the Arab mathematician Al-Kindi (c. 801 –873 AD), who formally developed the method to break ciphers. Letter frequency analysis gained importance in Europe with the development of movable ...

  8. National Origins Formula - Wikipedia

    en.wikipedia.org/wiki/National_Origins_Formula

    The revised national origins formula prescribed by the Immigration and Nationality Act of 1952, effective 1953, was simplified to multiply n by ⁠ 1 / 6 ⁠ of 1% (equivalent to decimal 0.00166666666̅) to arrive at roughly equivalent (but slightly reduced) quotas by a much streamlined process e.g.

  9. Australian dollar - Wikipedia

    en.wikipedia.org/wiki/Australian_dollar

    For example, a pre-decimal amount of nine pounds, sixteen shillings and sixpence (£9 16s 6d) became $19.65 in terms of dollars and cents. Since Australia was still part of the fixed-exchange sterling area , the exchange rate was fixed to the pound sterling at a rate of A$1 = 8s sterling (or £1 stg = A$2.50, and in turn £1 stg = US$2.80).