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  2. Penrose method - Wikipedia

    en.wikipedia.org/wiki/Penrose_method

    The Penrose method (or square-root method) is a method devised in 1946 by Professor Lionel Penrose [1] for allocating the voting weights of delegations (possibly a single representative) in decision-making bodies proportional to the square root of the population represented by this delegation.

  3. Standard deviation - Wikipedia

    en.wikipedia.org/wiki/Standard_deviation

    Here taking the square root introduces further downward bias, by Jensen's inequality, due to the square root's being a concave function. The bias in the variance is easily corrected, but the bias from the square root is more difficult to correct, and depends on the distribution in question.

  4. Pareto principle - Wikipedia

    en.wikipedia.org/wiki/Pareto_principle

    The Pareto principle may apply to fundraising, i.e. 20% of the donors contributing towards 80% of the total. The Pareto principle (also known as the 80/20 rule, the law of the vital few and the principle of factor sparsity [1] [2]) states that for many outcomes, roughly 80% of consequences come from 20% of causes (the "vital few").

  5. Gini coefficient - Wikipedia

    en.wikipedia.org/wiki/Gini_coefficient

    The Gini coefficient (after-taxes and transfers) for a total population ranged between 0.25 and 0.48, with Denmark the lowest and Mexico the highest. For the United States, the country with the largest population among OECD countries, the pre-tax Gini index was 0.49, and the after-tax Gini index was 0.38 in 2008–2009.

  6. Bayes' theorem - Wikipedia

    en.wikipedia.org/wiki/Bayes'_theorem

    Once again, the answer can be reached without using the formula by applying the conditions to a hypothetical number of cases. For example, if the factory produces 1,000 items, 200 will be produced by A, 300 by B, and 500 by C. Machine A will produce 5% × 200 = 10 defective items, B 3% × 300 = 9, and C 1% × 500 = 5, for a total of 24.

  7. Isotopes of antimony - Wikipedia

    en.wikipedia.org/wiki/Isotopes_of_antimony

    Antimony (51 Sb) occurs in two stable isotopes, 121 Sb and 123 Sb. There are 37 artificial radioactive isotopes , the longest-lived of which are 125 Sb, with a half-life of 2.75856 years; 124 Sb, with half-life 60.2 days; and 126 Sb, with half-life 12.35 days.

  8. Enron - Wikipedia

    en.wikipedia.org/wiki/Enron

    Enron Corporation was an American energy, commodities, and services company based in Houston, Texas.It was founded by Kenneth Lay in 1985 as a merger between Lay's Houston Natural Gas and InterNorth, both relatively small regional companies at the time of the merger.

  9. Obesity - Wikipedia

    en.wikipedia.org/wiki/Obesity

    People are classified as obese when their body mass index (BMI)—a person's weight divided by the square of the person's height—is over 30 kg/m 2; the range 2530 kg/m 2 is defined as overweight. [1] Some East Asian countries use lower values to calculate obesity. [11]