Nilai ekspektasi: Béda antarrépisi

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The expected values of the powers of ''X'' are called the ''moments'' of ''X''; the [[moment about the mean|moments about the mean]] of ''X'' are also defined as certain expected values.
 
In generalUmumna, theoperator expectednilai valueekspektasi operator is notteu multiplicative, i.e.contona E(''XY'') isteu notsarua necessarily equal tojeung E''X'' E''Y'', exceptiwal ifti lamun ''X'' andjeung ''Y'' arevariabel [[statistical independence|independentbebas]]. The differenceBedana, in the generalsacara caseumum, givesningkat rise to thejadi [[covariancekovarian]] andjeung [[correlation|korelasi]].
 
To empirically estimate the expected value of a random variable, one repeatedly measures values of the variable and computes the [[arithmetic mean]] of the results. This estimates the true expected value and has the property of minimizing the sum of the squares of the errors away from the expected value.