Here are some commonly used symbols in statistics.
μ is used to denote the population mean and σ is used for the population standard deviation. Some other very common and important ones are
x (with a bar on top) which is used for the sample mean and s which is used for sample standard deviation.
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Rule or principle frequency expressed in statistical symbols?
a general proposition not self-evident but proved by a chain of reasoning; a truth established by means of accepted truths.• a rule in algebra or other branches of mathematics expressed by symbols or formulas.
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There are different symbols for multiply, dividing and subtracting. You can use the symbols like "x, / and -".
Symbols are important because they have meaning to human beings. Letters and words are symbols of various concepts arranged in a way that transmits meanings. Numbers are other symbols representing concept. Musical notes are symbols as are pictures in a gallery.