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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. Hydrogen peroxide - Wikipedia

   en.wikipedia.org/wiki/Hydrogen_peroxide

   Hydrogen peroxide is a chemical compound with the formula H 2 O 2.In its pure form, it is a very pale blue liquid that is slightly more viscous than water.It is used as an oxidizer, bleaching agent, and antiseptic, usually as a dilute solution (3%–6% by weight) in water for consumer use and in higher concentrations for industrial use.

4. IQ classification - Wikipedia

   en.wikipedia.org/wiki/IQ_classification

   IQ classification. Score distribution chart for sample of 905 children tested on 1916 Stanford–Binet Test. IQ classification is the practice of categorizing human intelligence, as measured by intelligence quotient (IQ) tests, into categories such as "superior" or "average". [1] [2] [3] [4]

5. Great Depression - Wikipedia

   en.wikipedia.org/wiki/Great_Depression

   The Great Depression (1929–1939) was a severe global economic downturn that affected many countries across the world. It became evident after a sharp decline in stock prices in the United States, leading to a period of economic depression. [1] The economic contagion began around September 1929 and led to the Wall Street stock market crash of ...

6. List of genocides - Wikipedia

   en.wikipedia.org/wiki/List_of_genocides

   25% or more of the Arab population (50,000 people) of Zanzibar were killed by the end of 1964. Guatemalan genocide: Guatemala: 1962 1996 166,000: 166,000: The Guatemalan genocide was the massacre of Maya civilians during the Guatemalan Civil War (1960–1996) by successive US-backed Guatemalan military governments.

7. Sun - Wikipedia

   en.wikipedia.org/wiki/Sun

   The Sun is a G-type main-sequence star that makes up about 99.86% of the mass of the Solar System. It has an absolute magnitude of +4.83, estimated to be brighter than about 85% of the stars in the Milky Way, most of which are red dwarfs. [32] [33] The Sun is a Population I, or heavy-element-rich, [b] star. [34]