σ sigma is a letter of the Greek alphabet. Mathematicians use this symbol to signify standard deviation, an important measure of variation. Variation designates the distribution or spread about the average of any process.
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The blue Line designates narrow variation while the orange line designated wide variation. Obviously the less variation within a process makes the process more predictable, assuming the mean is not moving all over the place. If you took the height of everyone in class would you expect a large variation or narrow variation. What if you had a few professional basketball player in the room, would that widen or narrow the variation?
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