⊿ Point. {R} Glossary. ◢ Keyword: M. ◥ University. {q} PhD. {tr} Training. ⚫ UK. ↂ EndNote. ☝️ Weerakkody. Mean. General term for a numerical value summarizing a group of data For a data set, the arithmetic mean, also known as "arithmetic average", is a measure of central tendency of a finite set of numbers: specifically, the sum of the values divided by the number of values. The arithmetic mean of a set of numbers x1, x2, ..., xn is typically denoted using an overhead bar, ) to distinguish it from the mean, or expected value, of the underlying distribution, the population mean (denoted or [note 2]).[1] Outside probability and statistics, a wide range of other notions of mean are often used in geometry and mathematical analysis; examples are given below. Types of means[edit] Pythagorean means[edit] Arithmetic mean (AM)[edit] The arithmetic mean (or simply mean) of a list of numbers, is the sum of all of the numbers divided by the number of numbers. , usually denoted by , is the sum of the sampled values divided by the number of items in the sample.
Geometric mean (GM)[edit] Harmonic mean (HM)[edit] (denoted .