MÉDIA PONDERADA
Autor: Hi | Publicado: 2011-11-03T18:21:00-07:00

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MÉDIA PONDERADA
&nbsp;&nbsp;&nbsp; Nos cálculos envolvendo média aritmética simples, todas as ocorrências têm exatamente a mesma importância ou o mesmo peso. Dizemos então que elas têm o mesmo peso relativo. No entanto, existem casos onde as ocorrências têm importância relativa diferente. Nestes casos, o cálculo da média deve levar em conta esta importância relativa ou peso relativo. Este tipo de média chama-se média aritmética ponderada.
&nbsp;&nbsp;&nbsp; Ponderar é sinônimo de pesar. No cálculo da média ponderada, multiplicamos cada valor do conjunto por seu "peso", isto é, sua importância relativa.


DEFINIÇÃO DE MÉDIA ARITMÉTICA PONDERADA:A média aritmética ponderada p de um conjunto de números x1, x2, x3, ..., xn cuja importância relativa ("peso") é respectivamente p1, p2, p3, ..., pn é calculada da seguinte maneira:

EXEMPLO: Alcebíades participou de um concurso, onde foram realizadas provas de Português, Matemática, Biologia e História. Essas provas tinham peso 3, 3, 2 e 2, respectivamente. Sabendo que Alcebíades tirou 8,0 em Português, 7,5 em Matemática, 5,0 em Biologia e 4,0 em História, qual foi a média que ele obteve?


&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; Portanto a média de Alcebíades foi de 6,45.&nbsp;

Agora que voce já aprendeu a média ponderada, participe do site Aprender Matematica!