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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.
History 1983–1991: early years. AOL began in 1983, as a short-lived venture called Control Video Corporation (CVC), founded by William von Meister.Its sole product was an online service called GameLine for the Atari 2600 video game console, after von Meister's idea of buying music on demand was rejected by Warner Bros. Subscribers bought a modem from the company for $49.95 and paid a one ...
Desmond Thomas Doss (February 7, 1919 – March 23, 2006) [1] was an American United States Army corporal who served as a combat medic with an infantry company in World War II. Due to his religious beliefs, he refused to carry a weapon. He was twice awarded the Bronze Star Medal for actions on Guam and in the Philippines.
By 2055, the breakdown is estimated to be 48% non-Hispanic white, 24% Hispanic, 16% Black, and 14% Asian. [185] As of 2015, 14% of the United States' population is foreign born, compared to just 5% in 1965. Nearly 39 million immigrants have come to the U.S. since 1965, with most coming from Asia and Latin America.
5,500,000 km 2 (2,100,000 sq mi) The Amazon rainforest, [a] also called Amazon jungle or Amazonia, is a moist broadleaf tropical rainforest in the Amazon biome that covers most of the Amazon basin of South America. This basin encompasses 7,000,000 km 2 (2,700,000 sq mi), [2] of which 6,000,000 km 2 (2,300,000 sq mi) are covered by the ...
Schizophrenia is a mental disorder [17] characterized by reoccurring episodes of psychosis that are correlated with a general misperception of reality. [7] Other common signs include hallucinations (typically hearing voices ), delusions (i.e., paranoia ), disorganized thinking and behavior, [10] social withdrawal, and flat or inappropriate ...
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