PROBABILIDADE...
Autor: Marcilio Dias | Publicado: 2012-07-29T10:17:00-07:00

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1) Numa festa há 21 loiras, 18
morenas e 11 ruivas. Ao selecionarmos uma garota, ao acaso, qual a
probabilidade dela ser:

&nbsp;a) Morena&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
b) Ruiva.
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Solução. Determinando o número de elementos do
espaço amostral, temos: 21 + 18 + 11 = 50 pessoas.



a) Se há 18 morenas, a probabilidade de uma delas
ser selecionada será: Temos 18/50&nbsp; = 9/25





b) Se há 11 ruivas, a probabilidade de uma delas
ser selecionada será: Temos 11/50