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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.
Approximately 24.7% of the global population is aged under 15, while 65.2% is aged 15–64 and 10.1% is aged 65 or over. The median age of the world's population is estimated to be 31 years in 2020, [10] and is expected to rise to 37.9 years by 2050.
The Boeing 787 Dreamliner is an American wide-body airliner developed and manufactured by Boeing Commercial Airplanes . After dropping its unconventional Sonic Cruiser project, Boeing announced the conventional 7E7 on January 29, 2003, which focused largely on efficiency. The program was launched on April 26, 2004, with an order for 50 aircraft ...
For the fall of Constantinople, Marios Philippides and Walter Hanak list 15 eyewitness accounts (13 Christian and 2 Turkish) and 20 contemporary non-eyewitness accounts (13 Italian). Eyewitness accounts. Mehmed Şems el-Mille ve'd Din, Sufi holy man who gives an account in a letter; Tursun Beg, wrote a history entitled Tarih-i Abu'l Fath
List of countries by population (United Nations) This is a list of countries and other inhabited territories of the world by total population, based on estimates published by the United Nations in the 2022 revision of World Population Prospects. It presents population estimates from 1950 to the present. [2]
The environmental effects of shipping include air pollution, water pollution, acoustic, and oil pollution. [1] Ships are responsible for more than 18% of nitrogen oxides pollution, [2] and 3% of greenhouse gas emissions. [3]
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