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Baris ka-5: Sample mean is often used as an [[estimator]] of the [[central tendency]] such as the population mean. However, other estimators are also used. For example, the [[median]] is a more [[robust]] estimator of the central tendency than the sample mean. For a real-valued [[random variable]] ''X'', the mean is the [[~~expectation~~expected ~~operator~~value\|expectation]] of ''X''. If the expectation does not exist, then the random variable has no mean.

Mean: Béda antarrépisi