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Sigma (/ ˈsɪɡmə / SIG-mə; [1] uppercase Σ, lowercase σ, lowercase in word-final position ς; Greek: σίγμα) is the eighteenth letter of the Greek alphabet. In the system of Greek numerals, it has a value of 200. In general mathematics, uppercase Σ is used as an operator for summation.
Six Sigma (6σ) is a set of techniques and tools for process improvement. It was introduced by American engineer Bill Smith while working at Motorola in 1986. [1][2] Six Sigma strategies seek to improve manufacturing quality by identifying and removing the causes of defects and minimizing variability in manufacturing and business processes.
Founders. Phi Beta Sigma founders: A. Langston Taylor, (first row, center), Leonard F. Morse (first row; third from right) and Charles I. Brown (first row; third from left) with charter members of Phi Beta Sigma; Alpha Chapter in 1914. A. Langston Taylor, Esq. (January 29, 1890 - August 8, 1953) was the first international president of Phi Beta ...
The Greek letter sigma, from which the term "sigma male" derives its name. Sigma male (or simply sigma) is a term in internet slang used most often to describe the archetype of a male who is a "lone wolf". [1][2] While the name is a product of manosphere message boards in the 2010s, the term has gained widespread prominence within internet ...
Phi Beta Sigma Fraternity, Inc. (ΦΒΣ) is a historically African American fraternity. It was founded at Howard University in Washington, D.C., on January 9, 1914, by three young African-American male students with nine other Howard students as charter members.
Two Sigma Investments was founded in 2001 by John Overdeck, David Siegel and Mark Pickard. [2] [5] Siegel is a computer science Ph.D. from the Massachusetts Institute of Technology who worked for Tudor Investments, and Overdeck is an International Mathematical Olympiad Silver Medalist who subsequently studied mathematics at Stanford University and worked for Jeff Bezos in Amazon.com's early ...
Sigma Phi Omega was founded at the University of Southern California in 1949, and is the oldest Asian American sorority at USC and UT Austin and third oldest Asian sorority in the United States. It was originally established as a social organization for Japanese and Japanese American women at USC and has since then come to consist of a diverse ...
In statistics, the 68–95–99.7 rule, also known as the empirical rule, and sometimes abbreviated 3sr, is a shorthand used to remember the percentage of values that lie within an interval estimate in a normal distribution: approximately 68%, 95%, and 99.7% of the values lie within one, two, and three standard deviations of the mean, respectively.