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  2. Standard deviation - Wikipedia

    en.wikipedia.org/wiki/Standard_deviation

    The standard deviation σ of X is defined as which can be shown to equal. Using words, the standard deviation is the square root of the variance of X . The standard deviation of a probability distribution is the same as that of a random variable having that distribution. Not all random variables have a standard deviation.

  3. List of countries by percentage of population living in ...

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

    The new extreme poverty line of $2.15 per person per day, which replaces the $1.90 poverty line, is based on 2017 PPPs. This means that anyone living on less than $2.15 a day is considered to be living in extreme poverty. About 648 million people globally were in this situation in 2019.

  4. Madoff investment scandal - Wikipedia

    en.wikipedia.org/wiki/Madoff_investment_scandal

    The Madoff investment scandal was a major case of stock and securities fraud discovered in late 2008. In December of that year, Bernie Madoff, the former Nasdaq chairman and founder of the Wall Street firm Bernard L. Madoff Investment Securities LLC, admitted that the wealth management arm of his business was an elaborate multi-billion-dollar Ponzi scheme.

  5. Attention deficit hyperactivity disorder - Wikipedia

    en.wikipedia.org/wiki/Attention_deficit...

    0.8–1.5% (2019, using DSM-IV-TR and ICD-10) [2] Attention deficit hyperactivity disorder ( ADHD) is a neurodevelopmental disorder characterised by executive dysfunction occasioning symptoms of inattention, hyperactivity, impulsivity and emotional dysregulation that are excessive and pervasive, impairing in multiple contexts, and otherwise age ...

  6. 2000 United States presidential election - Wikipedia

    en.wikipedia.org/wiki/2000_United_States...

    The 2000 United States presidential election was the 54th quadrennial presidential election, held on Tuesday, November 7, 2000. Republican Texas Governor George W. Bush, the eldest son of George H. W. Bush, narrowly defeated incumbent Democratic Vice President Al Gore. It was the fourth of five U.S. presidential elections, and the first since ...

  7. Obsessive–compulsive disorder - Wikipedia

    en.wikipedia.org/wiki/Obsessive–compulsive...

    2.3% [6] Obsessive–compulsive disorder ( OCD) is a mental and behavioral disorder in which an individual has intrusive thoughts (an obsession) and feels the need to perform certain routines ( compulsions) repeatedly to relieve the distress caused by the obsession, to the extent where it impairs general function. [1] [2] [7]

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