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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.
Roald Dahl [a] (13 September 1916 – 23 November 1990) was a British author of popular children's literature and short stories, a poet, screenwriter and a wartime fighter ace. [1] [2] His books have sold more than 300 million copies worldwide. [3] [4] He has been called "one of the greatest storytellers for children of the 20th century".
t. e. Richard Morgan Fliehr [6] [a] (born February 25, 1949), known professionally as Ric Flair, is an American professional wrestler currently signed to All Elite Wrestling (AEW). Regarded by multiple peers [7] and journalists [8] as the greatest professional wrestler of all time, Flair has had a career spanning over 50 years in 6 decades.
One in 100 people (1%) worldwide [7] Autism, also called autism spectrum disorder [a] ( ASD) or autism spectrum condition ( ASC ), [8] is a neurodevelopmental disorder marked by restricted and repetitive patterns of behavior and deficits in reciprocal social communication. Other common signs include perseverative interests, stereotypic body ...
1346–1353. Deaths. 25,000,000 – 50,000,000 (estimated) The Black Death was a bubonic plague pandemic occurring in Europe from 1346 to 1353. It was one of the most fatal pandemics in human history; as many as 50 million people [2] perished, perhaps 50% of Europe's 14th century population. [3] The disease is caused by the bacterium Yersinia ...
1989 Tiananmen Square protests and massacre Part of the Cold War, the Revolutions of 1989 and the Chinese democracy movement Protesters in Tiananmen Square on 2 June (top), and tanks in Beijing in July (bottom) Date Initial protests: 15 April – 4 June 1989 (1 month, 2 weeks and 6 days) Massacre: 3–4 June 1989 (1 day); 35 years ago Location Beijing, China and 400 cities nationwide Tiananmen ...
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