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  2. Mental calculation - Wikipedia

    en.wikipedia.org/wiki/Mental_calculation

    Suppose one needs to square a number n near 50. The number may be expressed as n = 50 − a so its square is (50−a) 2 = 50 2 − 100a + a 2. One knows that 50 2 is 2500. So one subtracts 100a from 2500, and then add a 2. For example, say one wants to square 48, which is 50 − 2. One subtracts 200 from 2500 and add 4, and get n 2 = 2304.

  3. Percentage - Wikipedia

    en.wikipedia.org/wiki/Percentage

    A pie chart showing the percentage by web browser visiting Wikimedia sites (April 2009 to 2012) In mathematics, a percentage (from Latin per centum ' by a hundred ') is a number or ratio expressed as a fraction of 100. It is often denoted using the percent sign (%), [1] although the abbreviations pct., pct, and sometimes pc are also used. [2]

  4. Attributable fraction among the exposed - Wikipedia

    en.wikipedia.org/wiki/Attributable_fraction...

    In the exposed group, one third of the adverse outcomes can be attributed to the exposure (AFe = 1/3). In epidemiology , attributable fraction among the exposed (AF e ) is the proportion of incidents in the exposed group that are attributable to the risk factor.

  5. Voter turnout - Wikipedia

    en.wikipedia.org/wiki/Voter_turnout

    Indonesia, which before 1998 always had a high percentage of voter (more than 87%) but then dip down to low 70% in the 2014, [63] saw a record breaking voters in the 2019 Indonesian general election with more than 158 million people cast their ballots on the same day, [64] and has been called "the world's most complex one-day elections".

  6. Blackstone's ratio - Wikipedia

    en.wikipedia.org/wiki/Blackstone's_ratio

    Hale wrote: "for it is better five guilty persons should escape unpunished, than one innocent person should die." Fortescue's De Laudibus Legum Angliae (c. 1470) states that "one would much rather that twenty guilty persons should escape the punishment of death, than that one innocent person should be condemned and suffer capitally." [7]

  7. Hyperinflation in Zimbabwe - Wikipedia

    en.wikipedia.org/wiki/Hyperinflation_in_Zimbabwe

    Over the course of the five-year span of hyperinflation, the inflation rate fluctuated greatly. At one point, the US Ambassador to Zimbabwe predicted that it would reach 1.5 million percent. In June 2008, the annual rate of price growth was 11.2 million percent. The worst of the inflation occurred in 2008, leading to the abandonment of the ...

  8. List of countries by percentage of population living in poverty

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

    The first table lists countries by the percentage of their population with an income of less than $2.15 (the extreme poverty line), $3.65 and $6.85 US dollars a day in 2017 international PPP prices. The data is from the most recent year available from the World Bank API. [1] [2] [3]

  9. Birthday effect - Wikipedia

    en.wikipedia.org/wiki/Birthday_effect

    A similar study among 12,275,033 Swiss found the highest mortality on the actual birthday (17% greater than the expected value), and the effect was largest for those over 80; [2] another study on Swiss data found a 13.8% excess and was able to link this to specific causes: heart attack and stroke (predominant in women) and suicides and ...

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