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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.
Theodore Roosevelt Jr. [b] (October 27, 1858 – January 6, 1919), often referred to as Teddy or by his initials, T. R., was an American politician, statesman, conservationist, naturalist, and writer who served as the 26th president of the United States from 1901 to 1909. He previously held various positions in New York politics, rising up the ...
Lauren Opal Boebert ( / ˈboʊbərt / BOH-bərt; née Roberts; born December 19, 1986) is an American politician, businesswoman, and gun rights activist [3] serving as the U.S. representative for Colorado's 3rd congressional district since 2021. From 2013 to 2022, she owned Shooters Grill, a restaurant in Rifle, Colorado, where staff members ...
John Fitzgerald Kennedy (May 29, 1917 – November 22, 1963), often referred to as JFK, was an American politician who served as the 35th president of the United States from 1961 until his assassination in 1963. He was the youngest person elected president. [2] Kennedy served at the height of the Cold War, and the majority of his foreign policy ...
The Camino de Santiago (Latin: Peregrinatio Compostellana, lit. ' Pilgrimage of Compostela '; Galician: O Camiño de Santiago), or in English the Way of St. James, is a network of pilgrims' ways or pilgrimages leading to the shrine of the apostle James in the cathedral of Santiago de Compostela in Galicia in northwestern Spain, where tradition holds that the remains of the apostle are buried.
Mesopotamia [a] is a historical region of West Asia situated within the Tigris–Euphrates river system, in the northern part of the Fertile Crescent. Today, Mesopotamia is known as present-day Iraq and north-eastern Syria. [1] [2] In the broader sense, the historical region of Mesopotamia also includes parts of present-day Iran, Turkey, and ...
The British Broadcasting Corporation ( BBC) is a British public service broadcaster headquartered at Broadcasting House in London, England. Originally established in 1922 as the British Broadcasting Company, it evolved into its current state with its current name on New Year's Day 1927.
The Mississippi Delta, also known as the Yazoo–Mississippi Delta, or simply the Delta, is the distinctive northwest section of the U.S. state of Mississippi (and portions of Arkansas and Louisiana) that lies between the Mississippi and Yazoo rivers. The region has been called "The Most Southern Place on Earth" [1] ("Southern" in the sense of ...