2. In algebra, s stands for: distance. For example, the distance of A+the distance of B = the total distance.
In statistics, s stands for standard deviation. For example, the variance S 2 = [(x1-x) 2+(x2-x) 2+... (xn-x) 2]/(n) (x is the average).
4. In the distance measurement unit, s stands for: second. For example: 1 min =60s.
The area represented by the extended data ①S is a quantity representing the degree of a two-dimensional figure or shape or plane layer in a plane. A surface region is a simulation on a two-dimensional surface of a three-dimensional object. Area can be understood as the amount of material with a given thickness, which is necessary to form a shape model, or the amount of paint required to cover a surface with a single coating.
② Standard deviation expressed by S: it is most commonly used as a measure of statistical deviation in probability statistics. The standard deviation is defined as the square root of the arithmetic mean of the deviation square of the standard value of each unit from its average value. It reflects the degree of dispersion among individuals in a group.
Reference Baidu Encyclopedia-Regional Reference Baidu Encyclopedia-Standard Deviation