In mathematics, the Greek letter eta (η) is often used as a symbol representing various concepts, depending on the context. For example, in statistics, it can denote the efficiency of an estimator or a measure of effect size. In calculus, eta may represent a function or variable in specific equations. Additionally, it is used in physics and engineering to signify various parameters, such as viscosity or damping ratios.
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The mean is usually the arithmetic mean - there are other means in maths. For a set of numbers, the arithmetic mean is the sum of the numbers divided by the number of numbers.
ETA means Estimated Time of Arrival.
ETA
Zoe = life
ETD is the Estimated Time of Departure, and ETA is the Estimated Time of Arrival.
Estimated Time of Arrival.
electronic throttle actuator
Euskadi Ta Askatasuna or ETA is an armed Basque nationalist and separatist organization.
Estimated time of arrival
Estimated Time of Arrival Euskadi Ta Askatasuna
A expression in maths is a collection of terms without an equality sign.
division
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