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Learn what the median is, how to find it for different types of data sets, and why it is useful in statistics. The median is the value that separates the higher half from the lower half of a data sample, population, or probability distribution.
A mean is a numeric quantity that represents the center of a collection of numbers. Learn about different kinds of means in mathematics, statistics and geometry, and how to calculate them with formulas and examples.
The arithmetic mean is the sum of a collection of numbers divided by the count of numbers in the collection. It is denoted by the Greek letter or the symbol , and it has several properties and applications in mathematics and statistics.
Learn the common conventions and symbols used in probability theory and statistics, such as random variables, probability functions, parameters, and operators. See examples and definitions of terms like expected value, variance, covariance, independence, and critical values.
Central tendency is a statistical concept that measures the typical value of a probability distribution. Learn about different measures of central tendency, such as mean, median, mode, and their properties and applications.
Learn what a percentile is, how it is calculated and used in statistics, and how different methods can yield different results. Compare exclusive and inclusive definitions, nearest-rank and interpolation methods, and see illustrations and tables.
Learn what an average is and how to calculate different types of averages, such as arithmetic mean, median, mode and harmonic mean. Compare the general properties and applications of averages in statistics and mathematics.
Learn the meanings and uses of various mathematical symbols, such as + (plus sign), − (minus sign), × (multiplication sign), and more. See examples, syntax, and Unicode and LaTeX renderings of each symbol.