Variabel acak: Béda antarrépisi

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=== Momen ===
 
Sebaran probabiliti variabel random salawasna dicirikeun ku jumlah paramater nu saeutik, oge mibanda ''interpretasi'' praktis. Contona, ieucontona cukup dipikanyaho salakunyaho "nilai average". Hal ieu kawengku ku konsep matematik [[nilai ekspektasi]] variabel random, dilambangkeun ku E[''X'']. Catetan yen ilaharna , E[''f''(''X'')] '''teu''' sarua jeung ''f''(E[''X'']). MangsaLamun "nilai average" dipikanyaho, mangka sabaraha jauh tipikal nilai ''X'' tina nilai average, patarosan ieubisa dijawab ku [[varian]] sarta [[simpangan baku]] variabel random.
 
MathematicallySacara matematik, this is known asieu thedisebutna (generalisedgeneralisasi) [[problem of moments|masalah momen]]: forkeur akelas given class ofvariabel random variables ''X'' nu dibere, findteangan afungsi collectionkumpulan {''f<sub>i</sub>''} ofsaperti functionsnilai such that the expectation valuesekspektasi E[''f<sub>i</sub>''(''X'')] fullynu characterizesakabehna thenyirikeun distributiondistribusi of thevariabel random variable ''X''.
 
=== Equivalence of random variables ===