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  2. Distribution of wealth - Wikipedia

    en.wikipedia.org/wiki/Distribution_of_wealth

    Financial inequality was greater than inequality in total wealth, with the top 1% of the population owning 42.7%, the next 19% of Americans owning 50.3%, and the bottom 80% owning 7%. [39] However, after the Great Recession which started in 2007, the share of total wealth owned by the top 1% of the population grew from 34.6% to 37.1%, and that ...

  3. Mathematics - Wikipedia

    en.wikipedia.org/wiki/Mathematics

    Before the Renaissance, mathematics was divided into two main areas: arithmetic, regarding the manipulation of numbers, and geometry, regarding the study of shapes. [7] Some types of pseudoscience, such as numerology and astrology, were not then clearly distinguished from mathematics. [8] During the Renaissance, two more areas appeared.

  4. List of countries by income inequality - Wikipedia

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

    Income ratios include the pre-tax national income share held by top 10% of the population and the ratio of the upper bound value of the ninth decile (i.e. the 10% of people with highest income) to that of the upper bound value of the first decile (the ratio of the average income of the richest 10% to the poorest 10%).

  5. Expected value - Wikipedia

    en.wikipedia.org/wiki/Expected_value

    If I expect a or b, and have an equal chance of gaining them, my Expectation is worth (a+b)/2. More than a hundred years later, in 1814, Pierre-Simon Laplace published his tract " Théorie analytique des probabilités ", where the concept of expected value was defined explicitly: [ 8 ]

  6. List of countries by dependency ratio - Wikipedia

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

    The total dependency ratio is the total numbers of the children (ages 0–14) and elderly (ages 65+) populations per 100 people of adults (ages 15–64). A high total dependency ratio indicates that the adult population and the overall economy face a greater burden to support and provide social services for youth and elderly persons, who are often economically dependent.

  7. Abacus - Wikipedia

    en.wikipedia.org/wiki/Abacus

    The wireframe may be used either with positional notation like other abacuses (thus the 10-wire version may represent numbers up to 9,999,999,999), or each bead may represent one unit (e.g. 74 can be represented by shifting all beads on 7 wires and 4 beads on the 8th wire, so numbers up to 100 may be represented).

  8. The Biggest Loser (American TV series) - Wikipedia

    en.wikipedia.org/wiki/The_Biggest_Loser...

    41 lbs/18.6 kg Most Weight Lost in a week (Female) Patti Anderson (Couples 3 week 1) & Sonya Jones (Glory Days week 1) 23 lbs/10.4 kg Most Weight Lost in a week (not week 1) [Male] Neil Tejwani 33 lbs/15.0 kg Most Weight Lost in a week (not week 1) [Female] EW: Holley Mangold (Second Chances 2 Week 5) 19 lbs/8.7 kg

  9. List of countries by rate of natural increase - Wikipedia

    en.wikipedia.org/wiki/List_of_countries_by_rate...

    The birth rates [1] and death rates [2] in columns one and two are the CIA World Factbook estimates for the year 2022 unless otherwise noted, rounded to the nearest tenth (except for Mayotte and the Falkland Islands with 2010 and 2012 estimates respectively).