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  2. 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").

  3. Half dollar (United States coin) - Wikipedia

    en.wikipedia.org/wiki/Half_dollar_(United_States...

    The half dollar, sometimes referred to as the half for short or 50-cent piece, is a United States coin worth 50 cents, or one half of a dollar.In both size and weight, it is the largest circulating coin currently minted in the United States, [1] being 1.205 inches (30.61 millimeters) in diameter and 0.085 in (2.16 mm) in thickness, and is twice the weight of the quarter.

  4. 1% rule - Wikipedia

    en.wikipedia.org/wiki/1%_rule

    Pie chart showing the proportion of lurkers, contributors and creators under the 90–9–1 principle. In Internet culture, the 1% rule is a general rule of thumb pertaining to participation in an Internet community, stating that only 1% of the users of a website actively create new content, while the other 99% of the participants only lurk.

  5. Sodium hypochlorite - Wikipedia

    en.wikipedia.org/wiki/Sodium_hypochlorite

    [8] [20] A 1966 US patent claims that stable solid sodium hypochlorite dihydrate NaOCl·2H 2 O can be obtained by carefully excluding chloride ions (Cl −), which are present in the output of common manufacturing processes and are said to catalyze the decomposition of hypochlorite into chlorate (ClO − 3) and chloride. In one test, the ...

  6. Gray card - Wikipedia

    en.wikipedia.org/wiki/Gray_card

    A typical example is the Kodak R-27 set, which contains one 8 in × 10 in (20 cm × 25 cm) card and one 4 in × 5 in (10 cm × 13 cm) card, each with an 18% reflectance across the visible spectrum, and a white reverse side with a 90% reflectance.

  7. Middle gray - Wikipedia

    en.wikipedia.org/wiki/Middle_gray

    In photography, painting, and other visual arts, middle gray or middle grey is a tone that is perceptually about halfway between black and white on a lightness scale; [1] in photography and printing, it is typically defined as 18% reflectance in visible light.

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