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For an approximately normal data set, the values within one standard deviation of the mean account for about 68% of the set; while within two standard deviations account for about 95%; and within three standard deviations account for about 99.7%.
The purity of a gas is generally expressed as a grade prefixed with the letter N (rather than postfixed), indicating the "number of nines" in the percentage or decimal fraction. For example, a N2.0 gas is 99% (two nines) pure and 1% impurities by volume; a N6.0 gas is 99.9999% (six nines) pure, with 1 part per million (1 ppm or 1 vpm, volume ...
Median household wealth dropped by 36.1% compared to a drop of only 11.1% for the top 1%, further widening the gap. [ 44 ] [ 45 ] [ 46 ] During the economic expansion between 2002 and 2007, the income of the top 1% had grown 10 times faster than the income of the bottom 90% and 66% of total income gains went to the 1%.
Approximated number of apps in each category of downloads (as of May 10, 2024) [4] number of installs number of applications More than 10 billion: 10 More than 5 billion: 16 More than 1 billion: 86 More than 500 million: 112 More than 100 million: 874 More than 50 million: 1,225 More than 10 million: 8,272 More than 5 million: 7,764 More than 1 ...
The PLATO system was launched in 1960 at the University of Illinois and subsequently commercially marketed by Control Data Corporation.It offered early forms of social media features with innovations such as Notes, PLATO's message-forum application; TERM-talk, its instant-messaging feature; Talkomatic, perhaps the first online chat room; News Report, a crowdsourced online newspaper, and blog ...
Ethanol (also called ethyl alcohol, grain alcohol, drinking alcohol, or simply alcohol) is an organic compound with the chemical formula CH 3 CH 2 OH.It is an alcohol, with its formula also written as C 2 H 5 OH, C 2 H 6 O or EtOH, where Et stands for ethyl.
Indigenous statistics come from the U.S. Department of State's International Religious Freedom Act (2009), [85] based on the highest estimate of people identified as indigenous or followers of indigenous religions that have been well-defined. Due to the syncretic nature of these religions, the numbers may not reflect the actual number of ...
This chain of decay was later shown to have the mass number 99, and (...) the 6.6-h activity acquired the designation ‘technetium-99m. Later in 1940, Emilio Segrè and Chien-Shiung Wu published experimental results of an analysis of fission products of uranium-235, including molybdenum-99, and detected the presence of an isomer of element 43 ...