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Properties. The geometric centroid of a convex object always lies in the object. A non-convex object might have a centroid that is outside the figure itself. The centroid of a ring or a bowl, for example, lies in the object's central void. If the centroid is defined, it is a fixed point of all isometries in its symmetry group.
Covariance. The sign of the covariance of two random variables X and Y. Covariance in probability theory and statistics is a measure of the joint variability of two random variables. [1] The sign of the covariance, therefore, shows the tendency in the linear relationship between the variables. If greater values of one variable mainly correspond ...
New York is home to the most populous city in the country, and ranks 8th among the states in density. Despite a small population, Vermont has fairly average population density because of its small area. Idaho 's population has increased rapidly in recent decades, but its population density is lower than other states.
A length coordinate in polar, cylindrical, spherical, and toroidal coordinate systems, and toroidal and poloidal coordinates of the Earth's magnetic field. The correlation coefficient of a population parameter. The spectral radius of a matrix. A {\displaystyle A} denoted as. ρ ( A ) {\displaystyle \rho (A)} The plastic ratio.
The 2017 census found that the permanent population of Fiji was 884,887, compared to 837,271 in the 2007 census. The population density at the time in 2007 was 45.8 inhabitants per square kilometre, and the overall life expectancy in Fiji was 67 years. [1] Since the 1930s the population of Fiji has increased at a rate of 1.1% per year.
Great Zimbabwe is a medieval city in the south-eastern hills of the modern country of Zimbabwe, near Lake Mutirikwe and the town of Masvingo. It is thought to have been the capital of a kingdom during the Late Iron Age. [1] Construction on the city began in the 11th century and continued until it was abandoned in the 15th century.
v. t. e. In probability theory, the expected value (also called expectation, expectancy, expectation operator, mathematical expectation, mean, expectation value, or first moment) is a generalization of the weighted average. Informally, the expected value is the arithmetic mean of the possible values a random variable can take, weighted by the ...
In mathematics, a ( real) interval is the set of all real numbers lying between two fixed endpoints with no "gaps". Each endpoint is either a real number or positive or negative infinity, indicating the interval extends without a bound. An interval can contain neither endpoint, either endpoint, or both endpoints.